That battle, which took place at Zela, was against Pharnaces II of this kingdom.
A ruler of this kingdom ordered a coordinated massacre of Romans in several cities called the Asiatic Vespers. That ruler of this kingdom had his own son Machares killed and took over the throne of the Bosporan Kingdom from him. This kingdom lost the Battle of Orchomenus to the Romans. (*) Caesar summed up his victory in a battle against this kingdom with the words "I came, I saw, I conquered." That battle, which took place at Zela, was against Pharnaces II of this kingdom. Lucullus, Pompey and Sulla all fought in a series of three wars against a ruler of this kingdom who legendarily built up a gradual immunity to various poisons. For 10 points, name this kingdom ruled by Mithridates the Great.
A ruler of this kingdom ordered a coordinated massacre of Romans in several cities called the Asiatic Vespers.
Kingdom of Pontus (or the Pontic Empire; accept the Bosporan Kingdom before "Bosporan")