Triumvirate

A triumvirate (from Latin, "triumvirātus") is a political regime dominated by three powerful individuals, each a triumvir (pl. triumviri). The arrangement can be formal or informal, and though the three are usually equal on paper, in reality this is rarely the case. The term can also be used to describe a state with three different military leaders who all claim to be the sole leader.

Read more about Triumvirate:  Roman Triumvirates, Chinese Triumvirates, Tamil Triumvirate ( in South India ), Modern Triumvirates, Other Triumvirates