1230s

The 1230s were a decade that lasted from January 1, 1230 to December 31, 1239. It is distinct from the decade known as the 124th decade which began on January 1, 1231 and ended on December 31, 1240.

 Events 

 The Liverpool Castle started in 1232.
 Ducal state Brunswick-Luneburg was formed in 1235.
 St. Mark Basilica of Heraklion, Venitian Crete built in 1239