Yuri Dolgorukiy
In 1134, Yuri Dolgorukiy, the Prince of Moscow, founded the fortress of Ksnyatin in the mouth of the Nerl. In the end of the 12th century, the village of Nikola-na-Zhabne was founded at the mouth of the Zhabnya, where Kalyazin is currently located. In the 15th century, the Makaryev Monastery (later the Trinity Kalyazin Monastery) was founded on the left bank of the Volga across Kalyazin. By the time, Kalyazin belonged to the Grand Duchy of Moscow. In the beginning of the 17th century, during the Time of Troubles, Kalyazin was twice plundered by Polish-Lithuanian troops.