Li Shimin (Emperor Taizong of Tang)

Emperor Taizong of Tang, Li Shimin (598–649), was an outstanding statesman and military strategist whose life was filled with legend. Enlisting in the army in his youth, surviving the Xuanwu Gate Incident, and ultimately establishing the Reign of Zhenguan, his BaZi (Ba Zi) chart reveals the astrological logic behind his extraordinary life.

BaZi Chart

Verification of Birth Hour

Preferred hour: Yin (4:00 am). The Day Master (Ri Zhu), Wu Earth, sits on Wu, giving it deep and powerful roots. At the Yin hour, Jia appears as Seven Killings (Qi Sha); Seven Killings governs strategic acumen, decisiveness, and skill in military tactics, perfectly matching Li Shimin's youthful enlistment, his seizure of power at the Xuanwu Gate, and his decisive campaigns in all directions. The hidden stems Bing and Wu within Yin bolster Fire and Earth, providing both aggressive drive and the capacity to bear the burden of leadership, embodying his dual aptitude for military conquest and civil governance. The Month Branch (Yue Zhi), Chou, represents Direct Officer (Zheng Guan), symbolizing administrative achievement and propriety. The Yin hour merges the sharp aggression of Seven Killings with the order of Direct Officer, forging the foundation of his hegemony. Compared to other hours—the Mao hour leans toward a civil official, excessive Resource favors scholarship, excessive Wealth favors diplomatic strategy, and the Wu hour encourages self-reliance through Friend (Bi Jian)—none can simultaneously account for his military decisiveness and administrative wisdom. Therefore, the Yin hour is prioritized.

Core Analysis

Li Shimin's chart is Wu Wu, Yi Chou, Wu Wu, Jia Yin. Centered on the Wu Earth Day Master, it is supported by Wu Fire in the day pillar, while the hour stem Jia Yin carries a potent image of Seven Killings, creating an overall structure where military strategy and political adaptability coexist. The mutual generation of Fire and Earth reveals decisiveness and command ability; meanwhile, the protection of Resource (Yin Shou) sustains his civil governance and adherence to propriety.

His Luck Pillars (Da Yun) began in 602. In his early years, the Indirect Resource and Direct Resource of Bing Yin and Ding Mao supported his youthful military career and the development of his strategic mind. The Wu Chen Luck Pillar (Friend) from 622 to 631 was the critical phase for consolidating his power and securing victory at the Xuanwu Gate, favoring faction-building, military deployment, and the assistance of trusted allies. Subsequent Luck Pillars such as Ji Si and Geng Wu propelled his foreign conquests and the construction of court administration. Overall, the Seven Killings in his chart bestowed military genius and decisiveness, while Resource harmonized his civil governance, enabling him to wield the sword and rule the state, ultimately achieving the Reign of Zhenguan.

Trait Analysis

1. Command and Decisiveness: With Seven Killings sitting on Wu and supported by Friend, this demonstrates formidable military talent and rapid decision-making in combat. His destiny aided him in acting swiftly and accurately amid war and political coups.
2. Governance and Receptiveness to Counsel: The chart features the protection of Resource, particularly the bolstering of Indirect and Direct Resource in his early years, which facilitated the recruitment of talent and the establishment of institutions, forming the civil foundation of the Reign of Zhenguan.
3. Reliance on Trusted Aides: Multiple instances of Friend and Rob Wealth (Jie Cai) symbolize close associations with colleagues and a faction-building effect. While advantageous for rapid execution, this could also lead to an imbalance in personnel appointments or factionalism.
4. Ambition and Machiavellian Tendencies: The combination of Seven Killings and the Wu Earth Day Master brought a powerful desire for control, driving decisive actions such as the Xuanwu Gate Incident, yet it was accompanied by controversial, calculated stratagems.

Life Timeline

1. 615: At seventeen, he presented a strategy at Yanmen, first revealing his brilliance. The Annual Pillar (Liu Nian) was Yi Hai; the heavenly stem Yi Wood acted as Direct Officer, and the earthly branch Hai Water served as Indirect Wealth (Pian Cai)—both Wood and Water being elements favored by his chart. The Annual Pillar and the Luck Pillar formed a partial Wood three-harmony frame (Mao-Hai), further amplifying the power of Officer and Killings (Wood). Officer and Killings represent career, responsibility, and boldness. For him—a strong Day Master (Shen Qiang) who benefits from being controlled—this was the perfect moment to transform his abundant energy into action and achievement. Meanwhile, the annual branch Hai formed a directional Water frame (San Hui) with the branches of the Month and Hour Pillars; Water acts as the Wealth star, representing the convergence of opportunities and resources. The Luck Pillar's heavenly stem, Ding Fire (Direct Resource), combined with the Hour Pillar's heavenly stem, Ren Water (Indirect Wealth), forming a "Wealth combining with Resource" configuration. This meant he could fuse wisdom (Resource) with opportunity (Wealth), turning them into practical strategy and action. Presenting his strategy at Yanmen was the perfect manifestation of Officer and Killings disciplining the Day Master and his strategic intellect being revealed.

2. 616: At eighteen, he broke enemy lines with light cavalry, making a name for himself. Li Shimin was eighteen, right in the Ding Mao Direct Resource Luck Pillar, with the Annual Pillar being Bing Zi. His natal chart inherently possessed a powerful structure of "Yang Blade driving Killings," favoring Wood (Officer and Killings). The heavenly stem of the Annual Pillar, Bing Fire, served as the regulating favorable element (Tiao Hou), bringing drive and decisiveness. Like a warm winter sun, it endowed him with the courage to face danger without fear and to strike bravely. The earthly branch of the Annual Pillar, Zi Water, formed a dual clash (Zi-Wu clash) with the Wu Fire in the Year and Day Pillars of his natal chart. This was a year of clashing with the Grand Duke (Tai Sui), indicating drastic upheaval and conflict, perfectly matching the life-and-death struggle on the battlefield. At the same time, Zi Water also acted as the Wealth star; Wealth generates Officer, igniting the energy of the Jia Yin Seven Killings in the Hour Pillar. Seven Killings represents boldness, decisiveness, and military prowess. Catalyzed by the clash of the Annual Pillar, the full power of his "Yang Blade driving Killings" structure was unleashed, transforming his excessive Earth energy into a formidable weapon for charging enemy lines and securing victory. Thus, he rose to fame in a single battle, saving his father from peril.

3. 617: At nineteen, he showcased his brilliance beneath the walls of Chang'an, initially receiving the title of Duke and commanding the capital region. Li Shimin was in the Ding Mao Direct Resource Luck Pillar, with the Annual Pillar being Ding Chou. His natal chart inherently possessed a powerful structure of "Yang Blade driving Killings," favoring Wood (Officer and Killings). The heavenly stem of the Annual Pillar, Ding Fire (Direct Resource), protruded. Though it was an unfavorable element (Ji Shen), it combined with the Hour Pillar's heavenly stem, Ren Water, to form Wood (Ren-Ding combination). This transmuted the unfavorable Resource star into the favorable Officer and Killings—a phenomenon known as "transforming the unfavorable into the favorable"—signifying support from nobles and official recognition. More crucially, the annual branch Chou Earth combined with the Hour Pillar's branch Zi Water (Zi-Chou combination), constituting a "dual combination of stem and branch in the Hour Pillar." This is a strong signal of immense assistance, forging powerful alliances, and achieving rapid career success. Hidden within Chou Earth are Gui Water (Direct Wealth) and Xin Metal (Hurting Officer), representing the acquisition of practical benefits and territory (Direct Wealth) through military strategy (Hurting Officer). Furthermore, the Annual Pillar encountered auspicious symbolic stars (Shen Sha) such as the Heavenly Nobleman, Taiji Nobleman, and National Seal. His interpersonal relationships and official recognition reached a peak, perfectly fulfilling his illustrious achievements of conquering the capital, being enfeoffed as a Duke, and taking command of the capital region.

4. 618: At twenty, a bright star met its match at Qianshui Plain; his Direct Resource was restricted, leading to a setback. The Annual Pillar this year was Wu Yin. The heavenly stem Wu Earth (Friend) protruded as an unfavorable element, while the earthly branch Yin Wood (Seven Killings) acted as a favorable element. The Day Master was strong and benefited from Wood to loosen the Earth. With Seven Killings gaining ground in the Annual Pillar, it should normally signify holding military authority and making decisive strikes—a time for establishing merit. However, he was in the Ding Mao Luck Pillar, and the Luck Pillar's branch Mao Wood (Direct Officer) formed a destruction (Wu-Mao destruction) with the Wu Fire in the Year and Day branches. This destruction directly struck the foundation beneath the Day Master (Wu being the Yang Blade and military star of the Day Pillar), destabilizing his personal condition, hence the record of him "falling ill and convalescing." Simultaneously, the annual stem Wu Earth, an active unfavorable element representing colleagues and subordinates, clashed with the Hour Pillar's stem Ren Water (Indirect Wealth, father star). This Ren-Wu clash implied that subordinates (Friend) disobeyed orders and acted without authorization (clashing with a superior's commands), ultimately leading to military defeat. Though defeated in this battle, the annual Seven Killings still served as a favorable element, laying the groundwork for his subsequent military maturation.

5. 618: At twenty, the Battle of Qianshui Plain settled the cosmos; the youthful hero awed Longxi. This year, Li Shimin was in the Ding Mao Direct Resource Luck Pillar, with the Annual Pillar being Wu Yin. His natal chart inherently possessed a noble structure of "Yang Blade driving Killings," utilizing Seven Killings as a favorable element, representing boldness, decisiveness, and military genius. The annual branch Yin Wood (Seven Killings) marked the moment when Wood—the chart's favored element—became firmly rooted, immensely amplifying the power of Seven Killings. This meant his execution, decisiveness, and military command capabilities reached their zenith. Meanwhile, the annual branch Yin formed a partial Fire three-harmony frame (Yin-Wu) with the Wu Fire in the natal Year and Day branches. Fire acts as the Resource star, representing strategy, planning, and rear support; the successful formation of this Fire frame symbolized stable military stratagems and a secure foundation, forging a mighty combined force. The Luck Pillar's branch Mao formed a punishment (Zi-Mao punishment) with the natal Hour branch Zi; though this signifies internal pressure and undercurrents, it also provoked the ferocity and ambition of the Jia Yin Seven Killings in the Hour Pillar, transforming pressure into devastating battlefield offensives. This year, the heavenly stem Wu Earth (Friend) protruded; while technically an unfavorable element, it augmented his personal momentum and team cohesion. Overall, the favorable element Seven Killings met a prosperous ground and received support from the Resource frame. This is the astrological manifestation of him relying on extraordinary courage and military genius to lay the foundation of his hegemony in one stroke.

6. 620: At twenty-two, wherever his troops pointed, they encircled Luoyang. This year was the Geng Chen Annual Pillar. The heavenly stem Geng Metal (Eating God) protruded, combining with the Month Pillar's Yi Wood (Direct Officer) (Yi-Geng combination generating Metal). This image of "combining with the Officer" signified receiving major career opportunities and official recognition, favoring the expansion of territory and the establishment of merit. The annual branch Chen Earth acted as Friend; though an unfavorable element taking root, it harbors hidden stems Yi Wood (Direct Officer) and Gui Water (Direct Wealth), and formed a partial Water frame with the Hour Pillar's Zi Water, amplifying the power of Wealth and Officer. The Day Master was strong, using Wood (Officer and Killings) as the favorable element. This year, the Wood energy found ground in the Annual Pillar, perfectly matching his powerful "Yang Blade driving Killings" structure, enabling him to precisely transform his abundant vigor and audacity into battlefield strategy and execution. The year's symbolic stars gathered three great noblemen—Heavenly Virtue, Monthly Virtue, and Taiji—signifying immense intangible protection and extraordinary decisiveness. Thus, he could strategize masterfully in this crucial campaign and secure victory.

7. 621: At twenty-three, elite cavalry at Hulao Pass settled the cosmos; capturing a king in one battle awed the Central Plains. This year was the final year of the Ding Mao Luck Pillar (612–621). The Luck Pillar's heavenly stem Ding Fire (Direct Resource) combined with the Hour Pillar's Ren Water (Indirect Wealth), forming a Ren-Ding combination that generated Wood. Wood represents Officer and Killings, the most needed favorable element in his chart, symbolizing a significant elevation in his career structure and a concentration of authority. The Annual Pillar was Xin Si. The heavenly stem Xin Metal (Hurting Officer) protruded and clashed with the Month Pillar's Yi Wood (Direct Officer), forming a Hurting Officer meeting Direct Officer (Shang Guan Jian Guan). This signified using unconventional, risky military actions (Hurting Officer) to challenge established authority (Direct Officer), perfectly reflecting his tactic of a surprise cavalry assault to capture the enemy leader. The annual branch Si Fire served as the root for the regulating favorable element Bing Fire, bringing wisdom and decisiveness. His chart's structure of "Yang Blade driving Killings" reached its ultimate expression during this Luck Pillar and year, channeling his excessive Earth energy (Friend and Rob Wealth) through the dredging of Wood (Officer and Killings). This transformed into formidable boldness and leadership capable of defeating enemies and securing victory, laying the foundation of his hegemony in a single battle.

8. 621: At twenty-three, his horses drank from the Luo River, establishing dominion over the Central Plains. After defeating Dou Jiande, Li Shimin led his army to the gates of Luoyang. Seeing that all was lost, Wang Shichong opened the city and surrendered. The state of Zheng fell, and the commanderies of Shandong submitted one after another. The Tang dynasty essentially unified the north, laying the cornerstone for claiming the empire. This year was the last year of the Ding Mao Luck Pillar. The Luck Pillar's heavenly stem Ding Fire (Direct Resource) combined with the Hour Pillar's heavenly stem Ren Water (Indirect Wealth), forming a Ren-Ding combination that generated Wood. Wood represents Officer and Killings, the most needed favorable element in his chart, symbolizing a significant elevation in his career structure and a concentration of authority. The Annual Pillar was Xin Si. The heavenly stem Xin Metal (Hurting Officer) clashed with the Month Pillar's Yi Wood (Direct Officer) (Yi-Xin clash). This clash signified the forceful dismantling and replacement of the old order (the Zheng state). His chart followed the structure of "Yang Blade driving Killings"; as a strong Day Master, he used Seven Killings as his favorable element. During this Luck Pillar and year, the energy of Officer and Killings (Wood) was catalyzed by the Luck Pillar's combination and the Annual Pillar's trigger. It perfectly transformed his immense power (Yang Blade) into the boldness required for conquest and command, matching the epic achievement of pacifying an entire region and establishing unparalleled merit.

9. 621: At twenty-three, his merits eclipsed the world, reaching the pinnacle of ministerial power. After neutralizing formidable foes like Wang Shichong and Dou Jiande, Li Shimin presented his captives at the Imperial Ancestral Temple. Emperor Gaozu of Tang, Li Yuan, specially bestowed upon him the unprecedented title of "General of the Heavenly Strategy," ranking him above all princes and dukes, and permitted him to establish his own administrative office and appoint officials. His power and prestige reached their zenith, laying a solid foundation for his future ascension to the throne. This year was the final year of the Ding Mao Luck Pillar. The Luck Pillar's heavenly stem Ding Fire (Direct Resource) combined with the Hour Pillar's heavenly stem Ren Water (Indirect Wealth), forming a Ren-Ding combination that generated Wood. Wood represents Officer and Killings, the most needed favorable element in his chart, symbolizing a significant elevation in his career structure and a concentration of authority. The Annual Pillar was Xin Si. The heavenly stem Xin Metal (Hurting Officer) clashed with the Month Pillar's Yi Wood (Direct Officer) (Yi-Xin clash). This clash signified the forceful dismantling and replacement of the old order (the Zheng state). His chart followed the structure of "Yang Blade driving Killings"; as a strong Day Master, he used Seven Killings as his favorable element. During this Luck Pillar and year, the energy of Officer and Killings (Wood) was catalyzed by the Luck Pillar's combination and the Annual Pillar's trigger. It perfectly transformed his immense power (Yang Blade) into the boldness required for conquest and command, matching the epic achievement of pacifying an entire region and establishing unparalleled merit.