On March 15, 44 BC, the day marked for the Dictator’s assassination, Trebonius was the person who distracted Mark Antony into a conversation, kept him outside the Theatre of Pompey while Caesar was being stabbed. Having been nominated by Caesar for the post of proconsul for Asia, he immediately left for the province during 44 BC. While there, he raised money and troops for Brutus and Cassius. He also helped Cassius on his way to Syria later in the year. Later, he attempted to fast-track Publius Cornelius Dolabella in his passage through Asia by providing whatever supplies he needed, as well as refusing to open cities for Dolabella. However, Dolabella took Smyrna in Asia Minor, where he captured Trebonius in the process. In January 43 BC, Dolabella put Trebonius on trial for treason before proceeding to torture him and then behead him.