Kassia famous byzantine Hymnographer
Kassia, Cassia or Kassiani (Greek: Κασσιανή, romanized: Kassianí, pronounced [kasia’ni]; c. 810 – before 865) was a Byzantine-Greek composer, hymnographer and poet.[1] She holds a unique place in Byzantine music as the only known woman whose music appears in the Byzantine liturgy.[2] Approximately fifty of her hymns are extant, most of which are sticheron, though at least 26 have uncertain attribution.[1] The authenticity issues are due to many hymns being anonymous, and others ascribed to different authors in different manuscripts. She was an abbess of a convent in the west of Constantinople.

Additionally, many epigrams and gnomic verses are attributed to her,[3] at least 261.[4] Kassia is notable as one of at least two women in the middle Byzantine period known to have written in their own names, the other being Anna Comnena.[5] Like her predecessors Romanos the Melodist and Andrew of Crete, the earliest surviving manuscripts of her works are dated centuries after her lifetime.

Kassia – Wikipedia

https://en.wikipedia.org/wiki/Kassia