Octavian's prestige and, more importantly, his legions' loyalty had been boosted by Julius Caesar's legacy of 44 BC, by which he was officially adopted as Caesar's only son and the sole legitimate heir of his enormous wealth. Antony had been the most important and most successful senior officer in Caesar's army ("magister equitum") and, thanks to his military record, claimed a substantial share of the political support of Caesar's soldiers and veterans. Both Octavian and Antony had fought against their common enemies in the Liberators' civil war that followed the assassination of Caesar.