Peace of Terrer Historical milestone · Terrer, Comunidad de Calatayud, Zaragoza Image of Terrer, not of the place itself. In 1363, during the War of the Two Peters, the peace between Pedro IV of Aragón, the Ceremonious, and Pedro I of Castile, the Cruel, was negotiated in Terrer, after the town withstood the Castilian siege. Of the castle that defended it, stretches of rammed-earth wall from its double enclosure above the Jalón survive. siglo XIV Photo: Jose Manuel Mota Camera location41° 19′ 39.04″ N, 1° 42′ 49.18″ W View this and other nearby images on: OpenStreetMap (CC BY 2.0) What to see and do in Terrer