paragraph_text: Njen je otac bio car Ivan Aleksandar Bugarski,<ref>Nikephoros Gregoras Vol. III, Historiæ Byzantinæ XXXVII, 48-51, str. 557. koji je oženio Židovku koja je rodila Keracu.<ref>Ivan Bozhilov, ''The family of the Asens (1186-1460). Genealogy and prosopography''.