Catherine of Bulgaria

Catherine
Augusta
Byzantine Empress consort
Tenure1057–1059
SpouseIsaac I Komnenos
FatherIvan Vladislav of Bulgaria
MotherMaria

Catherine of Bulgaria (Church Slavonic: Єкатерїна, Greek: Αἰκατερίνη, romanizedAikaterini, Bulgarian: Екатерина, romanizedEkaterina; died after 1059) was empress consort to Byzantine emperor Isaac I Komnenos and co-regent of Constantine X for a period after the abdication of her spouse in 1059. She was a daughter of Ivan Vladislav of Bulgaria and his wife Maria, and thus a sister of Presian and Alusian. Catherine was also a paternal aunt of Maria of Bulgaria.