When did the first Triumvirate rule in Rome?

The First Triumvirate did not actually rule Rome. It controlled its politics, but it did not rule. It was an informal alliance between three powerful men which was kept secret for some time. Its enormous political influence was unofficial and consisted of the political intrigues of the triumvirs (three men). It had no official status.

The triumvirate Gaius Julius Caesar, Marcus Licinius Crassus, and Gnaeus Pompeius Magnus (Pompey the Great) was formed in 60 BC and ended when Crassus died in 53 BC.