This is a collection of Professor Ian Brownlie's 1990 Robb Lectures which were delivered at the University of Auckland. At a time when the rights of minorities are of great concern, this work covers important international aspects of the rights of the Maori--the native people of New Zealand--under the Treaty of Waitangi which was signed in 1840 between the Maori chiefs and Queen Victoria and became the foundation of New Zealand as a British colony.