Ricimer

Ricimer, as magister militum, led a revolt against Emperor Avitus, defeating him at the Battle of Placentia. Avitus was deposed and later died, establishing Ricimer as the power behind the throne in the Western Roman Empire.

Ricimer deposed and executed Emperor Majorian, whom he had previously supported. This act demonstrated Ricimer's control over the Western Empire and led to a series of weak emperors who served at his pleasure.

Ricimer besieged Rome to depose Emperor Anthemius, whom he had appointed. After capturing the city, Ricimer allowed his troops to sack it, causing widespread destruction. Anthemius was killed, and Ricimer installed Olybrius as emperor.