Ivan Nikitich Tsarsky (1789-1853) - Moscow merchant, famous Old Believer figure, honorary citizen, owner of a unique collection of Old Believer manuscripts and old printed books. Together with the books, Tsarsky also acquired manuscripts, which in their dignity and antiquity were a very valuable collection. Among these manuscripts, Kubarev's "Praise to Vladimir Yaroslavov of Time" and two words of Bishop Clement were first found - they are the ones described in this edition.