Plaza Mayor de Almagro is a town square located in the city of Almagro, Castile-La Mancha, Spain.Amalgro is designated a conjunto histórico (a heritage listing), and the square is of architectural interest. It is the location of the city hall and a historic theatre, the Corral de comedias de Almagro.Amalgro is a name of Arabic origin (المغرة , al-magra) referring to the local red clay, which is one of the materials used in the plaza mayor. Probably the settlement began as a small Muslim castle, possibly on the site now occupied by the hermitage of San Juan. The fief was bestowed on Gonzalo Yáñez de Noboa, ninth Grand Master of the Order of Calatrava, after the Battle of the Navas de Tolosa, and the grant was confirmed by Ferdinand III in 1222. Amalgro became an important centre for the Ord