It’s Zhuge Liang.
"The merits of the three-pointed kingdom are called the Eight Formations?" This comes from the "Eight Formations" by Du Fu, a poet of the Tang Dynasty. The full text is as follows:
The merits of the three-pointed kingdom are called the Eight Formations. into eight formations.
The stone in the river will not turn, and the regret will be swallowed by Wu.
Translation:
During the Three Kingdoms period, Kong Ming’s achievements were the most outstanding, and the Bagua array he created has become famous throughout the ages.
Despite the impact of the river current, the stone remains the same. The thousand-year regret is due to Liu Bei's mistake in trying to annex Wu.
This poem was written in the first year of Dali of Emperor Daizong of Tang Dynasty (766). The first two lines of this poem praise Zhuge Liang's great achievements, especially his military talents and achievements; the last two lines express regret that Liu Bei lost his army by swallowing Wu, which ruined Zhuge Liang's grand cause of uniting Wu with Cao Cao to unify China.
Extended information:
Zhuge Liang information:
Zhuge Liang (181-October 8, 234), courtesy name Kongming, nickname Wolong, was the capital of Langya Yang in Xuzhou (now Yinan County, Linyi City, Shandong Province), was the prime minister of Shu during the Three Kingdoms period, an outstanding politician, strategist, diplomat, writer, calligrapher, and inventor.
In his early years, he followed his uncle Zhuge Xuan to Jingzhou. After Zhuge Xuan's death, Zhuge Liang lived in seclusion in Longzhong. Later, Liu Bei visited the thatched cottage three times to invite Zhuge Liang, and joined forces with Sun Yat-sen to fight against Cao Cao, and defeated Cao's army in the Battle of Chibi. It formed a tripartite power among the Three Kingdoms and captured Jingzhou.
In the 16th year of Jian'an (211), Yizhou was captured. Then he defeated Cao Jun and captured Hanzhong. In the first year of Shu Zhangwu (221), Liu Bei established the Shu Han regime in Chengdu, and Zhuge Liang was appointed prime minister to preside over the government.
After Liu Chan, the lord of Shu, succeeded to the throne, Zhuge Liang was named the Marquis of Wuxiang and led the pastoral care of Yizhou. Be diligent and prudent, handle all political affairs personally, and strictly enforce rewards and punishments; alliance with Soochow to improve relations with all ethnic groups in the southwest; implement the policy of farming and strengthen war preparations.
The six Northern Expeditions to the Central Plains were mostly spent on food but in vain. He eventually became ill due to overwork and died of illness in Wuzhangyuan (now Qishan, Baoji, Shaanxi) in the 12th year of Jianxing Shu (234) at the age of 54. Liu Chan posthumously named him the Marquis of Zhongwu, and later generations often addressed him as Marquis of Wu.
Baidu Encyclopedia - Eight Formations
Baidu Encyclopedia - Zhuge Liang