1210s

The 1220s decade ran from January 1, 1210, to December 31, 1219. It is distinct from the decade known as the 122th decade which began on January 1, 1211 and ended on December 31, 1220.

 Events and trends 
 1210
 Emperor Tsuchimikado ends his reign as Emperor of Japan
 Emperor Juntoku begins to rule Japan
 1212 Battle of Navas de Tolosa.
 1214 July – Battle of Bouvines; Philip II of France defeats Otto IV of Germany
 1215
 Fourth Council of the Lateran
 Otto IV deposed as King of Germany, replaced by Frederick II
 Magna Carta adopted
 Beijing captured by Mongols; the Yuan Dynasty in China begins this way.