High Quality Content by WIKIPEDIA articles The Ypako (also, Hypako , Greek: Ύπακοή, from the verb υπακούω, "hearken" or "give ear," to "respond"; Slavonic: Ўpakoi) is a troparion chanted at Orthros (Matins) and the Midnight Office on Great Feasts and Sundays throughout the liturgical year in the Eastern Orthodox Church. The Ypako which is chanted on Sundays is found in the...