Galba vs Yujiulu Shelun

Galba was proclaimed emperor by the Roman Senate after the suicide of Nero. He was governor of Hispania Tarraconensis and had rebelled against Nero. His accession ended the Julio-Claudian dynasty and began the Year of the Four Emperors.

Galba was murdered by Praetorian Guards in the Roman Forum after adopting Lucius Calpurnius Piso as his successor. His unpopularity and failure to pay the Praetorians led to his overthrow by Otho. This event triggered a series of civil wars.

Yujiulu Shelun united the Rouran tribes and declared himself Khagan, founding the Rouran Khaganate. He established a nomadic empire on the Mongolian steppe, adopting the title 'Khagan' and organizing a powerful cavalry force that threatened Northern Wei.

Shelun led a major raid into Northern Wei territory, penetrating deep into the frontier. The Rouran cavalry looted settlements and captured prisoners, but were eventually repelled by Northern Wei forces. This raid established the Rouran as a persistent threat.

Yujiulu Shelun was defeated by a Northern Wei army under Emperor Daowu (Tuoba Gui) in a battle in the Gobi Desert. The Rouran suffered heavy losses, and Shelun was forced to flee. This defeat temporarily weakened the Rouran Khaganate.

After his defeat by Northern Wei, Yujiulu Shelun died under uncertain circumstances, possibly killed by his own followers or in battle. His death led to a succession struggle among the Rouran, but the khaganate survived under his successors.