|  The 16th century was an important step in the Monastery architectural history.  The document mentions that in the mid 16th century, when the stone walls were constructed, the territory was enlarged and  rearranged. In 1559 – 1585, the Assumption Cathedral was constructed  in the central square to the order of  Ivan the Terrible. It repeated the shapes of the Assumption Cathedral of  the Moscow Kremlin, that was the symbol of the state power. The Cathedral is monumental and severe. There are five feebly expressed apses from the east. The white surface of the walls is divided by massive vertical pilasters.  They support semi-circular gables. Two rows of high narrow windows emphasize the impressively thick walls. Between them there is a decorative belt of arches and columns. The curve-linear    roofing is crowned by five massive cupolas. 
 
  The interior  looks festive and majestic due to bright light and  fine   frescoes on the walls,  vaults and supporting pillars.  The  frescoes were produced  by 35 Yaroslavl and  local Trinity painters, supervised by  Dmitry and Grigory Plekhanov, 99 years after the construction of the Cathedral. The frescoes are narrative their  colors are bright and cool.  The iconostasis includes five rows of icons. The wood-carved frames are gilded. There are 76 icons of the 17th – 18th cc. in the iconostasis. The Evangelists on the Royal Doors were painted by the tsar  isographer Simon Ushakov. Behind the iconostasis there are wooden  three-tier  choirs. Two huge copper  church chandeliers of the 17th century were made by the craftsmen of the Armory Chamber of the Moscow Kremlin and presented to the Monastery by  Boyar  Yanov. 
 As other monuments, the Cathedral was greatly changed in the course of time. Thus, in the 18th century, the curvy-linear gables were replaced by a hip roof that resulted in the superstructure of the  central drum, the spherical  cupolas were replaced by onion shapes, the stone parvis at the western wall was dismantled, the colorful porches  appeared at three facades. ,,,,, cupola At the end of the 19th century the Crypt of All Saints was arranged under the Cathedral. It notably weakened  the foundation.  The changes  affected the constructions. Now the Cathedral is one of the most problematic buildings requiring constant examination and necessary reinforcement works.
 
 
 Godunov Vault  
  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.
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