Daniel Adrian Hamid Kadir Efendi (born 1965) is the husband of Princess Ioanna of Greco-Turkey. He is also a descendant of the former Ottoman sultans. He was born in France and came to Greco-Turkey in 1975 with his family. There he met Princess Ioanna and they married in 1989. They have three kids: Prince Paul of Greco-Turkey, Princess Katerina of Greco-Turkey and Prince Michael of Greco-Turkey.