Order of the Knights of Concórdia

The Order of Concord was a military order which historiography claims was founded by Ferdinand III of Castile in 1261, although that monarch died in 1251 and Alfonso X of Castile was reigning in the supposed year of its foundation. Other sources assert that it was founded by Ferdinand II of Castile in the same year, 1261, although that monarch's reign ended in 1188.