Marcus Aemilius Lepidus (triumvir) in the context of "Interrex"

The lex Titia was a Roman law passed on 27 November 43 BC that established the Triumvirate of Octavian, Mark Antony and Marcus Aemilius Lepidus for five years until the end of 38 BC. The triumvirate established by the law was then renewed in 38 BC. Unlike the so-called First Triumvirate, which was a private arrangement among three men, the Second Triumvirate was a legal instrument which created a formal legal framework to empower the three triumvirs with practically absolute power.

The Bellum Siculum (Latin for "Sicilian War") was an Ancient Roman civil war waged between 42 BC and 36 BC by the forces of the Second Triumvirate and Sextus Pompey, the last surviving son of Pompey the Great and the last leader of the Optimate faction. The war consisted of mostly a number of naval engagements throughout the Mediterranean Sea and a land campaign primarily in Sicily that eventually ended in a victory for the Triumvirate and Sextus Pompey's death. The conflict is notable as the last stand of any organised opposition to the Triumvirate.

The result of the war settled the question whether the political ascendancy of the autocratic Triumvirs could be reversed, ending all hopes for the restoration of the constitutional government of the Roman Republic. The war however also led to the breakdown of the Triumvirate itself since Octavian was able to take advantage of discontent in Lepidus' camp to sideline his partner, leaving Octavian and Mark Antony as only rulers of the Roman world and setting the stage for the War of Actium.