The word is a compound of "sebastos" ("venerable", the Greek equivalent of the Latin Augustus) and "kratōr" ("ruler", the same element as is found in "autokratōr", "emperor").
# Anna (or Theodora), who married the sebastokratōr Peter before 1253.
Her paternal grandparents were sebastokrator Isaac Doukas Vatatzes (died 1261), the older brother of Emperor John III Doukas Vatatzes and his unnamed wife.