Konstantin-Assen, Prince of Vidin
Konstantin-Assen, Prince of Vidin, Duke of Saxony (born 5 December 1967) is the fourth son of Tsar Simeon II of Bulgaria and his wife Doña Margarita Gómez-Acebo y Cejuela. He is known also as Konstantin-Assen of Bulgaria and Konstantin-Assen of Vidin, the latter being the title of the fourth son of Bulgarian kings. He was born in Madrid. Simeon II was exiled as a child when Bulgaria ceased to be a monarchy, so Simeon's wife and children never received any royal titles from Bulgaria.