Fa Zheng

Fǎ Zhèng was an adviser for Shu during the Three Kingdoms era of China. He was born in 176 AD during the fall of the Han Dynasty. He was originally a subordinate of Liu Zhang but later helped with Liu Bei's invasion of the region that would become known as Shu. After the death of Pang Tong, Fa Zheng was arguably the greatest tactician for the Shu-Han and was one of Liu Bei's more reliable vassals.

Historical Information
At Liu Bei's invasion of Hanzhong, he acted as military adviser for Liu Bei, then, successfully defeated Cao Cao's army and seized Hanzhong.

When he died in 220 due to illness, Liu Bei was said to have bitterly wept for many days afterward. Liu Bei had then bestowed upon him the unique honor of a posthumous name, the Maruquis of Wing. According to Zhuge Liang's opinion, if Fa Zheng were still alive, he could have prevented Liu Bei from attacking Sun Quan in the aftermath of Guan Yu's death. If Liu Bei had still gone anyway, he would not have lost the Battle of Yi Ling.