Caesar Ally is a term used to refer to the alliance between Julius Caesar and Marcus Licinius Crassus, two of the most powerful men in Rome during the first century BC. The term COCA is an acronym for 'Crassus, Octavian, Caesar, Antony', which are the four members of the alliance. This alliance was formed to increase the political power of each member and to protect their interests. It was a major factor in the fall of the Roman Republic and the rise of the Roman Empire.