San Juan del Hospital is the oldest temple in Valencia, founded by the military and hospital order of St. John of Jerusalem on the plots ceded by King James I as a reward for their military support in the reconquest of the city. On them would be risen this national monument that is a reference of medieval architecture of the S XIII. Its old late romanesque aspect is altered by new gothic air of Cistercian austerity that give it the aspect shown today. Several chapels corresponding to noble families show fresco paintings and beautiful carvings worthy of admiration, surprising the major chapel since it keeps the remains of the Empress of Byzantium Constanza Augusta of Hohenstaufen. The visit is completed with the northern patio and cemetery as well as the pointed arches corresponding to the old hospital of pilgrims.