Matches in DBpedia 2014 for { ?s ?p Jacob Svetoslav (Bulgarian: Яков Светослав, Yakov Svetoslav) (ca. 1210s/1220s–1275 or 1276/1277) was a prominent 13th-century Bulgarian noble (bolyarin) of princely Russian origin. Bestowed the title of despot, Jacob Svetoslav was the ruler of a widely autonomous domain of the Second Bulgarian Empire most likely located around Sofia. Seeking further independence and claiming the title of Emperor of Bulgaria, he twice changed allegiance from Bulgaria to the Kingdom of Hungary and vice versa, and the Hungarians recognized his Bulgarian royal rank as their vassal and ruler of Vidin (medieval Bdin).. }
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- Jacob_Svetoslav abstract "Jacob Svetoslav (Bulgarian: Яков Светослав, Yakov Svetoslav) (ca. 1210s/1220s–1275 or 1276/1277) was a prominent 13th-century Bulgarian noble (bolyarin) of princely Russian origin. Bestowed the title of despot, Jacob Svetoslav was the ruler of a widely autonomous domain of the Second Bulgarian Empire most likely located around Sofia. Seeking further independence and claiming the title of Emperor of Bulgaria, he twice changed allegiance from Bulgaria to the Kingdom of Hungary and vice versa, and the Hungarians recognized his Bulgarian royal rank as their vassal and ruler of Vidin (medieval Bdin).".