Diarchies

Diarchy (from Greek δι-, di-, "double", and -αρχία, -arkhía, "ruled"), duarchy, or duumvirate (from Latin duumvirātus, "the office of the two men") is a form of government characterized by corule, with two people ruling a polity together either lawfully or de facto, by collusion and force. The leaders of such a system are usually known as corulers.Historically, diarchy particularly referred to the system of shared rule in British India established by the Government of India Acts 1919 and 1935, which devolved some powers to local councils, which had included native Indian representation under the Indian Councils Act 1892.