On April 20, 1622, Sahaidachny died in Kyiv from wounds he suffered at the Battle of Khotyn. He was later buried in the Bratsky Monastery of Kyiv. He left his assets to the brotherhood schools in Kyiv and Lviv for church causes. His legacy was so great, that most of the population of Kyiv attended his funeral "en masse". Sahaidachny's work, "About Union", was highly regarded by the Lithuanian Kanclerz Lew Sapieha. In 1646, John III Sobieski, a monarch of the Polish–Lithuanian Commonwealth, said the following about Sahaidachny: