Kassia or Kassiani (805/810 - before 865) was an Eastern Roman abbess, poet, composer, and hymnographer. She is one of the first medieval composers whose scores are both extant and able to be interpreted by modern scholars and musicians. Kassia is notable as one of only two Eastern Roman women known to have written in their own names during the Middle Ages, the other being Anna Comnena.
Kassia is notable as one of only two Eastern Roman women known to have written in their own names during the Middle Ages, the other being Anna Comnena.