The vast walled area of the monastery comprises two separate priories with eleven churches, most of them dating to the 16th century. Of these, nine belong to the Uspensky (Dormition, the Orthodox equivalent of the Catholic holiday known as the Assumption of Mary) priory by the lake. The Dormition cathedral, erected by Rostov masters in 1497, was the largest monastery church built in Russia up to that date. Its 17th-century iconostasis features many ancient icons, arranged in five tiers above a silver heaven gate endowed by Tsar Alexis in 1645. A lot of valuable objects kept in the sacristy are personal gifts of the tsars who visited the monastery.