Koi
Koi's surviving churches give a concrete record of building in the eighteenth and early nineteenth centuries. The large Trinity church in the village centre was erected between 1717 and 1731, with the main construction campaign running from 1724 to 1731. Its position made it the principal architectural landmark of the settlement. A second church, dedicated to Saint John the Theologian and dated to 1833, stood in the cemetery at some distance from the centre. Approached from Sonkovo, it formed a separate landmark at the village entrance. These two buildings mark distinct parts of the community's religious landscape: the central parish space and the outlying burial ground, each given a substantial church before the middle of the nineteenth century.