[1] As a close ally of Grand Duke Vytautas, he was one of the chief diplomats in the conflict over Samogitia with the Teutonic Knights.
[1] Die Littauischen Wegeberichte mention Czapornendorff between Rudamina and Šalčininkai (Theodor Hirsch identified the location with the village of Tabariškės on Merkys River).
[5] Čiupurna was first mentioned in written sources in 1395 as a witness to a donation of land and property to Vilnius Cathedral by Grand Duke Vytautas.
[1] It appears that his relationship with the Knights was friendly as in 1403 komtur of Balga sent him spurs, a symbol of knighthood,[6] and in 1407 Teutonic Grand Master inquired about Čiupurna's health and paid for his medical treatments in Prussia.
[7] The last mention of Čiupurna is on January 23, 1411, when he, Vytautas, and Jogaila signed a document allowing envoys of the Grand Master to travel freely.