What is "anthologion"

Anthologion, or Anthologue, is a church book that has been in use among the Greeks.

The Anthologion is a sort of breviary or mass-book, containing the daily 'divine offices' addressed to Jesus Christ, the Virgin Mary, and the principal saints. Other common offices include those of prophets, apostles, martyrs, pontiffs, and confessors, according to the Greek rite.

It is called άνθολόγιον, q.d. florilegium, or a collection of flowers.