蛋堡
The remains of the Roman-era structures and later fortifications were demolished by local residents in the 9th century to prevent their use by Saracen raiders. The first castle on the site was built by the Normans in the 12th century. Roger the Norman, conquering Naples in 1140, made Castel dell 'Ovo his seat. The importance of the Castel dell'Ovo began to decline when king Charles I of Anjou built a new castle, Castel Nuovo, and moved his court there. Castel dell'Ovo became the seat of the Royal Chamber and of the State Treasury. It also served as a prison. In 1191, Empress Constance of the Holy Roman Empire, daughter of Roger, was captured during her struggle with her nephew Tancred, King of Sicily for the crown of Sicily, and Sicilian Chancellor Matthew d'Ajello wrote to Tancred persuading him to lock her in the island Castel dell'Ovo to be better-guarded and secluded from people, and wrote to nobleman Aligerno Cottone in charge of defending Naples ordering him to "ut imperatricem in Castro Salvatoris ad mare benè custodiat" (guard the empress in "Castle of the Savior" (i. e. Castel dell'Ovo) in the sea properly). However, Constance was released the next year and finally became Queen of Sicily. In 1268, King Conradin was imprisoned here before his trial and execution. Also imprisoned here were children of Manfred, King of Sicily after his failure. In 1381, Queen Joanna I of Naples was also imprisoned there for a time after forced to surrender to her enemy Charles of Durazzo, the future Charles III of Naples, before her assassination.