The area was the site of several battles during
"The Deluge", the 17th century war between the Polish-Lithuanian
Commonwealth and Sweden. In 1655 a short-lived treaty with Sweden, the Union of
Kėdainiai, was signed by two members of Radziwiłł family in their Kėdainiai
castle. While little remains of the Radziwiłł castle, the crypt of the
Calvinist church (1631) houses the family mausoleum, including the tombs of
Krzysztof Radziwiłł and his son Janusz.
Scottish Protestants arrived in the late 16th and
17th centuries, encouraged by the conversion
