The church is situated in the centre of the village Agiasos and is dedicated to the Dormition of the Virgin. It is a three-aisled post-Byzantine basilica (32,20 x 26,20 m.), with a marble templon made in the beginning of the 19th century and with wall paintings dating from 1838.

In the church's yard there is an ecclesiastical museum with numerous remarkable exhibits from the area around. The church constitutes one of the most important places of pilgrimage on Lesbos. An impressive folklore festival takes place on the 15th of August.