The Palace of the Popes was the seat of the papacy for 24 years, from 1257 until 1281. It was erected in its present form by expanding the headquarters building of the Bishop's Curia at the time of Pope Alexander IV. Because of the hostility of the people and of the Roman upper classes, he decided to move all the headquarters of the Papal Curia to Viterbo. From the beautiful and famous Loggia dei Papi, with its elegant and harmonious architecture, you enter the great hall, known as the Hall of the Conclave, for the Papal audience. Here was held the first and longest conclave in history, namely that of 1268-‐1271, lasted 1006 days.