 He and Andrew the Blind were among the first to compose hymns (idiomela) in the Triodion (the liturgical book used during Great Lent), chanted during the period between the Sunday of the Publican and Pharisee and Palm Sunday.These idiomela are stichera of which two were written for each weekday of Great Lent.One is chanted at the aposticha of Vespers and one at the aposticha of Matins, each being chanted twice.