Metropolitan Archive focused on the most important documentation coming from the office of the head of the Russian Church (acts of church legal life - conciliar sentences, posed, unsubscribed, sworn letters of hierarchs, etc., and epistolaries - messages from the lords and metropolitan), materials received by the metropolitan from the sovereign departments and monasteries sent by the hierarchs of the Eastern Church, as well as letters from the grand ducal treasury (foreign policy materials, spiritual and contractual letters, cross-kiss notes, etc.).