Princess Hayu of Yogyakarta is the fourth child and daughter of Sultan Hamengkubuwono X of Yogyakarta and his consort, Ratu Hemas. She is married to Prince Notonegoro, an executive in the United Nations Development Programme Indonesia and a professional in the United Nations, New York, United States.

Sri Sultan Hamengkubawono X is the Sultan of the historic Yogyakarta Sultanate in Indonesia and is currently also the Governor of the modern Yogyakarta Special Region.