White Serbia (Serbian: Бела Србија/Bela Srbija), called Boiki (rendered in Serbian as Bojka), is the mythical homeland of the ancestors of the Serbs, the White Serbs (Beli Srbi). Boiki is mentioned in De Administrando Imperio, a 10th-century work by Byzantine Emperor Constantine VII (r. 913–959) The area adjacent to White Serbia was known as White Croatia, where the Croats trace their origin. White Serbia and its ethnic designates, the White Serbs, could be interpreted through attributes such as "the unbaptized" or "pagan" (Pre-Christian), according to the DAI.