John III Doukas Vatatzes
Theodora Vatatzaina () was a daughter of John Doukas (born 1215) and his wife Eudokia Angelina. Her paternal grandfather was "sebastokrator" Isaac Doukas Vatatzes (died 1261), the older brother of the Nicaean emperor John III Doukas Vatatzes (). Theodora's maternal grandfather was "protostrator" John Komnenos Angelos; his name indicates he was a member of the Angelos family, but his exact relations to the reigning members of the family are not known. Her grandmother's name is not known.