Who did not belong to the first triumvirate of Rome?

The First Triumvirate was an informal political alliance of three prominent men between 60 and 53 BC, during the late Roman Republic: Gaius Julius Caesar, Gnaeus Pompeius Magnus (Pompey the Great), and Marcus Licinius Crassus. The alliance ended in 53 BC when Marek Krassus died in the Battle of Carrhae. The result of this was the crossing of Rubicon by Caesar in 49 BC and the beginning of the civil war with Pompey.