According to tradition, Agnello of Naples, now co-patron (compatrono) of the city of Naples, is buried in the Sant'Agnello Maggiore. Agnello was a 6th-century Neapolitan bishop, who defended the city against the besieging Lombards. Supposedly the church had been founded and devoted to the Virgin, by Agnello's parents. Recent studies have shown that the church was built atop an Ancient Roman Acropolis from the 4th century. When Sant'Agnello died, the church's name was changed to Santa Maria dei Sette Cieli (of the Seven Heavens). In the 9th century, Bishop Athanasius of Naples built a new religious building and dedicated to the abbot Saint Agnello and placed his relics in the church. During the Middle Ages, the cult of Sant'Agnello became increasingly important and the end of the 13th century till 1517.
From 1510 to 1600, the church rebuilt and enlarged by the archbishop Giovanni Maria Poderico. The transept, previously the church of Santa Maria Intercede was reconstructed as part of this church in 1517 and work inside continued on till the 18th century. The main altar by Girolamo Santacroce, had additions by Giovanni Battista Pandullo. Vincenzo Martinoredid the pavement.
On August 7, 1809, the monastic order in charge of the church was suppressed and sold by the Minister of Finance to a private citizen Cosimo d'Orazio. The second world war added damage. In 1962, during reconstruction the remains of the ancient acropolis were found. Vandalism, earthquakes, and decay have contributed to its poor state of conservation. In 2011, after a long restoration, the church has reopened.
The church still retains medieval traces in bas reliefs. The paintings moved here are of uncertain attribution. Only the main altar sculpted by Girolamo Santacroce is original.References:
Ängsö Castle was first named as "Engsev" in a royal charter by king Canute I of Sweden (r. 1167-1196), in which he stated that he had inherited the property after his father Eric IX of Sweden. Until 1272, it was owned by the Riseberga Abbey, and then taken over by Gregers Birgersson.
From 1475 until 1710, it was owned by the Sparre family. The current castle was built as a fortress by riksråd Bengt Fadersson Sparre in the 1480s. In 1522, Ängsö Castle was taken after a siege by king Gustav Vasa, since its owner, Fadersson's son Knut Bengtsson, sided with Christian II of Denmark. However, in 1538 it was given by the king to Bengtsson's daughter Hillevi Knutsdotter, who was married to Arvid Trolle.
In 1710, the castle was taken over by Carl Piper and Christina Piper. Ängsö Castle was owned by the Piper family from 1710 until 1971, and is now owned by the Westmanna foundation. The castle building itself was made into a museum in 1959 and was made a listed building in 1965. It is currently opened to visitors during the summers.
The castle is a cubical building in four stores made by stone and bricks. The lower parts is preserved from the middle ages. It was redecorated and expanded in the 1630s. The 4th storey as well as the roof is from the expansion of Carl Hårleman from 1740-41. It gained its current appearance in the 1740s.