Vidin

Vidin was a Bulgarian realm centered on the Danube fortress of the same name. Ivan Sratsimir, son of Tsar Ivan Alexander, proclaimed himself emperor there in 1356 after his half-brother was chosen as heir to the Bulgarian throne.

Hungarian forces occupied his lands, but were driven out with his father's help. After Ivan Alexander died in 1371, Sratsimir broke with Tarnovo; following the crusaders' defeat at Nicopolis in 1396, the Ottomans seized Vidin and imprisoned him.