He is not known to have left any descendants; however, there is a legend from Viipuri/Vyborg, the formerly Finnish seaport that is now in Russia, of a clandestine love affair between Patrikeyev-Kosoi and a local woman named Sigrid Toth. This would have occurred during the Swedish-Russian War of 1495-97, when Patrikeyev-Kosoi was the commander of the Russian army that invaded Swedish-controlled Finland. <!No mention is made of them having any children, but this is a possibility that should not be discounted. There is a DNA research project currently underway to discover the roots of the Gediminid and Rurikid dynasties - see www.familytreedna.com/public/rurikid. Since Patrikeyev-Kosoi was a Gediminid prince, this project could discover his possible male descendants, if they exist. They would probably be found in Finland today, or among people whose families were in Finland in the late 15th century. The two modern Gediminid families that would be most closely related to Patrikeyev-Kosoi are the Kurakin (Courakin) and Golitsyn (Galitzine) families. Males of these two family lines are encouraged to take the DNA test in order to help solve this mystery. And, havomg taken those testrs, these Golitsyn and Khovanski helped to reconstruct the gediminid modal profile of Y DNA. Nobody in Finland has yet been found to be close enough with that modal to be really a direct descendant. The tested "Kosonen" was not close enough.