Diocesan Museum of Gaeta is a historic building Palazzo De Vio, which belonged to the natives Cardinal Tommaso De Vio. Over the past few centuries the Palazzo was reconstructed several times, it has completely changed its original appearance.

The idea of ​​creating the Diocesan Museum originated in 1903 on the occasion of the start of construction of the new facade of the Duomo Gaeta, dedicated to St. Erasmus and the Assumption. It was also the beginning of a collection of medieval and later religious subjects. In the following years were added to the collection of paintings of the central nave of the cathedral, have survived from the 13th century. The collected artifacts became the nucleus for the creation of an impressive collection of works of art and a small archaeological museum. Among the exhibits are paintings of religious buildings destroyed during the Second World War, destroyed and secularized churches.

In the 1950s, the final decision on the establishment of the Diocesan Museum, which was inaugurated in the cloister of the Cathedral in 1956. And in 1998, the museum's collection moved to a specially restored Palazzo De Vio.

Today, in the Diocesan Museum can be seen paintings on canvas and wood, dating from the 13th century and until the second half of the 19th century. All the works, most of which is devoted to religious topics - it exhibits from the old museum, the cathedral and other churches, now closed for worship. In the pictures shown here can be traced to the history of artistic thought Campaign for centuries. In general, this collection is the largest in the southern Italian region of Lazio, which today refers Gaeta.

The vast number of paintings in the museum belongs to the local artist Giovanni Gaeta, who worked in the second half of the 15th century. Among the other artists - painters Scipio Pultsone, Sebastiano Conca, Riccardo Kvartararo, Teodoro d'Erriko known as Dutchman, Girolamo Imparato, Fabrizio Santafede and others.

In the private lounge of Palazzo De Vio can see two Byzantine cross, the tabernacle and the Goblet of Pope Pius IX the mid-19th century. Also on display in the halls of the gallery choirs 1569-70-second period works Vincenzo Ponta.