The person that is the mother of XXX is who?
Andronikos IV Palaiologos
Andronikos IV Palaiologos (or Andronicus IV Palaeologus) (Greek: Ἀνδρόνικος Δ' Παλαιολόγος, Andronikos IV Palaiologos) (2 April 1348 -- 28 June 1385) was Byzantine Emperor from 1376 to 1379.