Near the north-western corner of the Assumption Cathedral there is a low small tent with a hip roof . It is the vault of the 18th century. It contains the relics of Tsar Boris Godunov, his wife Maria, son Feodor and daughter Xenia, buried at the beginning of the 17th century under the parvis. The western facade, facing the central square, contains four marble stones with the names and dates in the following order: “In the year of 7113 (1605) on the 10th of June died Feodor Borisovich, blessed tsarevich of all Russia; in the year of 7113 (1605) on the 1st of May died Boris, blessed tsar and grand prince of all Russia, monk Bogolep; in the year of 7113 (1605) on the 10th of June died Maria Grigoryevna, blessed tsarina and princess of all Russia; in the year of 7130 (1622) on the 30th of August died tsarina Olga Borisovna.