Mercurius of the Caves

Venerable Mercurius of the Caves was a faster who lived the ascetic life in the Kiev Caves Monastery in the fourteenth century. He is known above all for his spiritual union with Venerable Paisius: the two saints were inseparable, lived in the same cell, and after death were laid in a single coffin. Their relics now rest in the Far (Saint Theodosius) Caves of the Caves Lavra.

The Azbyka page says no more than that he was a monk of the monastery and was bound to Paisius (commemorated on 19 July, 1 August in the new style) by unity of mind and brotherly love. Mercurius is commemorated on 28 March, with the Synaxis of all the Venerable Fathers of the Kiev Caves (a movable day), and on 10 September, with the Synaxis of the Venerable Fathers of the Far Caves, in the new style.