Saint Sergei Radoniezhsky, founder of the Holy Martyr Monastery, is a prominent religious activist. In 1337 he built a small church in the wilderness and lived in seclusion, he advocated collective accommodation and monasticism, and followed his monasticism, which gradually developed into the largest and richest monastery in Russia. The monastery not only possessed large tracts of land, but also stored large quantities of grain, grass, weapons and ammunition, which became a defensive position in the north of Moscow at the time. In 1608, the Polish army besieged Sergeyev, trying to open the gap to Moscow, but it was tenaciously blocked here for 16 months, and the monastery became a flag of Russia's unyielding spirit. In 1744, it was named the Grand Monastery and is a representative of the classical architecture of the northeast Ross.