Final answer:
Lepidus was part of the Second Triumvirate with Mark Antony and Octavian, but his power waned after he was pushed aside by the other members, leaving him without a significant seat of power.
Step-by-step explanation:
Lepidus was a member of the Second Triumvirate, which was formed in 43 BCE and included Mark Antony, Octavian (later known as Augustus), and himself. Initially, after defeating Julius Caesar's assassins, they divided power among themselves, with Octavian taking Europe and Mark Antony taking the eastern territories and Egypt. However, Lepidus's seat of power became less significant after he was sidelined by the other two triumvirs, particularly as Octavian and Mark Antony grew in strength and eventually pushed him out of the Triumvirate, leaving no specific region under his control. Lepidus's influence and power greatly diminished following this, and he became a relatively minor figure in the subsequent political developments leading up to the establishment of the Principate under Augustus.