The Church of the Holy Assumption of Moscow keeps unique relics of the Christian world, the only ones in the Russian Federation. Among them is a fragment of the True Cross, which the Catholicos gave to the church on its opening day. The church acquired the relic of Gregory the Illuminator in a Paris auction. Lately, a relic of Saint Barbara has been added to the unique relics of the church, brought to Moscow from one of the old Greek monasteries.
