Quintus Sertorius vs Yeon Gaesomun

Quintus Sertorius was appointed governor of Hispania Citerior by the Marian faction during the civil war against Sulla. After Sulla's victory, Sertorius fled to Africa and then returned to Spain to lead a rebellion.

Sertorius established a rival Roman government in Hispania, with a senate, army, and alliance with local Iberian tribes. He created a school for Iberian nobles and governed effectively, winning widespread support among both Romans and natives.

Sertorius defeated the Roman general Quintus Caecilius Metellus Pius at the Battle of the Sucro River. The victory solidified his control over much of Hispania and demonstrated his military skill against Sullan forces.

Sertorius was assassinated by his own lieutenant, Marcus Perperna, during a banquet. Perperna, jealous of Sertorius's authority, led a conspiracy that ended the rebellion. Perperna was later defeated by Pompey, ending the Sertorian War.

Yeon Gaesomun led a military coup, killing King Yeongnyu and hundreds of nobles. He installed King Bojang as a puppet ruler and assumed the position of Dae Mangniji (Supreme Commander), establishing a military dictatorship over Goguryeo.

Yeon Gaesomun refused to submit to Tang Chinese demands for tribute and recognition, asserting Goguryeo's sovereignty. His aggressive stance led to multiple Tang invasions and a prolonged war that drained both empires.

Yeon Gaesomun led the defense of Ansi Fortress against a massive Tang Chinese invasion led by Emperor Taizong. The Goguryeo forces held out for months, inflicting heavy casualties and forcing the Tang army to retreat, preserving Goguryeo's independence.

Yeon Gaesomun died, leading to a power struggle among his sons. This internal division weakened Goguryeo, allowing the Tang-Silla alliance to conquer the kingdom in 668, ending its 700-year history.