February 16, 2017 saw the 750th anniversary of the 1267 Treaty of Badajoz, signed by Afonso III of Portugal and Alfonso X of Castile and Léon. This treaty is commonly given as the date at which the Algarve became indisputably Portuguese, writes Peter Booker of the Algarve History Association.*
But why was it necessary to have a treaty with Castile over the status of the Algarve? And was it the final step in consolidating the border between Portugal and Spain?