Who is XXX's mother?
Stefan Uroš V
Saint Stefan Uroš V (Serbian: Свети Стефан Урош V; 1336 -- 2/4 December 1371), known in historiography as Uroš the Weak (Урош Нејаки/Uroš Nejaki), was king of the Serbian Empire (1346--1355) as co-regent of his father Stefan Uroš IV Dušan Silni (``The Mighty'') and then Emperor (tsar) (1355--1371).