John VII Palaiologos was the son of Emperor Andronikos IV Palaiologos and Keratsa of Bulgaria , a daughter of Emperor Ivan Alexander of Bulgaria and Theodora of Wallachia .
Head entity: john vii palaiologos Q37074 0 1 2
Tail entity: keratsa of bulgaria Q2840790 12 13 14
Relation (head \u2192 tail): P25
Inverse relation (tail \u2192 head): P40