Christian IV undertook a number of projects in
Norway that were largely based on
Renaissance architecture. He established mining
operations in Kongsberg and the
Røros, now a
World Heritage Site. After
a devastating fire in 1624,
the town of Oslo was moved to a new location and
rebuilt as a fortified city with an orthogonal
layout surrounded by ramparts, and renamed
Christiania.
Kong Christian also founded the trading city of
Kristiansand,
naming them after himself.