Secretary of State for Dominion Affairs

The position of secretary of state for dominion affairs was a secretary of state in the Government of the United Kingdom, responsible for British relations with the Empire’s dominions – Canada, Australia, New Zealand, South Africa, Newfoundland, and the Irish Free State – and the self-governing Crown colony of Southern Rhodesia. When initially created in 1925, the office was held in tandem with that of secretary of state for the colonies; this arrangement persisted until June 1930.

Source: Wikipedia — Secretary of State for Dominion Affairs (CC BY-SA 4.0)