Here are some - there may be more :
Kristiania in Norway (originally called Christiania, NOW called Oslo).
Kristiansand in Norway (originally Christianssand)
Kristianstad in present day Sweden
Kristianobel in present day Sweden
Christianshavn in Denmark. (Originally independent town, later absorbed by Copenhagen)
Note : Not all of the above was necessarily founded by Christian 4 - in some cases the name was changed as part of a re-location of an existing town(s).
Christian IV of Denmark was born on April 12, 1577.
Christian IV of Denmark was born on April 12, 1577.
King Christian IV of Denmark and Norway was born on April 12, 1577.
King Christian IV of Denmark and Norway was born on April 12, 1577.
King Christian IV of Denmark and Norway died on February 28, 1648 at the age of 70.
King Christian IV of Denmark and Norway died on February 28, 1648 at the age of 70.
King Christian IV of Denmark and Norway was born on April 12, 1577 and died on February 28, 1648. King Christian IV of Denmark and Norway would have been 70 years old at the time of death or 438 years old today.
There has been 10 kings of Denmark called Christian as their main name (and then a lot who has it as one out of several middle names). The longest reign was that of Christian IV : 60 years from 1588 (age 11!) to 1648.
Valdemar IV of Denmark was born in 1320.
Valdemar IV of Denmark died in 1375.
Canute IV of Denmark was born in 1042.
Eric IV of Denmark was born in 1216.