Please explain the Primacy of the Spains

The Primacy of the Spains (Portuguese: Primaz das Espanhas; Spanish: Primado de las Españas, Catalan: Primat de les Espanyes) is the primacy of the Iberian Peninsula, historically known as Hispania or in the plural as the Spains. 

The Archbishop of Braga, in Portugal, has claimed this primacy over the whole Iberian Peninsula since the middle ages, however today his primacy is only recognized in Portugal. The Archbishop of Toledo in Spain has claimed the Primacy of Spain, as the primate above all other episcopal sees in Spain. 

In addition, the Archbishop of Tarragona in Catalonia also make use of the title. The Archbishops in Braga, Toledo and Tarragona, if raised to the rank of cardinal, are known as Cardinal-Primates.