Alexander Jagiellon
Where the modern town is today located, in the 15th century there was the Mažieji Pienionys (Little Pienionys) estate. At the end of the 15th century, the Grand Duke of Lithuania Alexander Jagiellon transferred the estate to Stanislovas Kovarskis, the treasurer of the king. As he had no successors, the estate was inherited by his brother, Andrius Kovarskis, the canon of the Vilnius Cathedral. Thus, the name of the Little Pienionys estate was changed to Kavarskas.