Prince Notonegoro is a professional at the United Nations Development Programme, Apia, Samoa. He is the spouse of Princess Hayu of Yogyakarta, daughter of Sultan Hamengkubuwono X and Ratu Hemas.

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.