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A '''Sessional Hymn''' is a set of [[troparion|troparia]] (hymns) chanted after each kathisma from the Psalter at Matins which is normally preceded by a small [[litany]]. In [[w:Greek Language|Greek]], these hymns are called "kathisma" (because they follow the Psalm readings of the same name. In [[Church Slavonic|Slavonic]] it is called a ''sedálen'' from ''sediti'', "to sit" (Cf. [[w:Latin language|Latin]] ''sedere'', "to sit").<ref>''The Festal Menaion'' (Tr. Mother Mary and Archimandrite [[Kallistos (Ware) of Diokleia|Kallistos Ware]], Faber and Faber, London, 1984), p. 553.</ref> Hymns with the same name are also used after the Polyeleos, for Saints of Polyeleos or
Virgil Rank, and the phrase is also used for the hymns after the third ode of the [[canon]] at Matins.