Wikipedia
Karijotas
Karijotas or Koriat (baptized Michal; died between 1358 and 1363) was the Duke of Navahrudak and Vaŭkavysk, one of the sons of Gediminas, Grand Duke of Lithuania.
According to Polish historian Jan Tęgowski, he was born probably between 1305 and 1308. He was baptized before 1349.
In 1349 Algirdas sent him along with two sons, Aikštas or Eikšis from Eišiškės and Simeon from Svislach, to Jani Beg, Khan of the Golden Horde, to negotiate an alliance against the Teutonic Knights and rising Grand Duchy of Moscow. However, Jani Beg handed Karijotas over to Simeon of Russia for a ransom.