 Today's Barro formed part of one of the first constitutional city councils, the one of Trasumia, belonging to the judicial party of Caldas de Reyes.In 1822, when Galicia was divided into four provinces, Caldas de Reyes increased in municipalities; however Ferdinand VII of Spain overruled the changes in 1823 and effectively returned the organization of the Old Regime.In 1835 new proposals for the municipal arrangement were made, where Caldas de Reyes would have had six city councils.