Metropolitan Alexei of Moscow vowed to establish a monastery and cathedral in Moscow if he survived a severe storm that he encountered at sea, in 1358, on his journey back to Moscow from Constantinople, and that he would name it for the saint on whose feast day he arrived safely in Moscow. The day he arrived in Moscow was a day dedicated to Our Savior. In 1361, he founded the monastery dedicated to Our Savior (in Russian: Spas) on the bank of the Yausa River.