Kassia (also Kassiane, Kassiani, Casia, Ikasia, Cassia, or Eikasia; between 805 and 810 - bef. 867) was a Greek-Byzantine 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. Approximately fifty of her hymns are extant and twenty-three are included in Orthodox Church liturgical books. The exact number is difficult to assess, as many hymns