Dormition of the Theotokos references on wikipedia
Dormition_of_the_Theotokos The Dormition of the Theotokos ( Koímēsis, often anglicized as Kimisis) is a Great Feast of the Eastern Orthodox, Oriental Orthodox and Eastern Catholic Churches which commemorates the "falling asleep" or death of the Theotokos (Mary, the mother of Jesus; literally translated as God-bearer).