One of the most frequently altered churches in the Loire Valley, St-Aignan was consecrated in 1509 in the form you see today. It possesses one of France's earliest vaulted hall crypts, complete with polychromed capitals. Scholars of pre-Romanesque art view the place with interest; its 10th- and 11th-century aesthetics are rare. Aboveground, the church's Renaissance-era choir and transept remain, but the Protestants burned the nave during the Wars of Religion.
In a wood-carved shrine are the remains of the church's patron saint Aignan, or Agnan(358-453). He was the Bishop of Orléans, who assisted Roman general Flavius Aetius in the defense of the city against Attila the Hun in 451.
References:Visby Cathedral (also known as St. Mary’s Church) is the only survived medieval church in Visby. It was originally built for German merchants and inaugurated in 1225. Around the year 1350 the church was enlarged and converted into a basilica. The two-storey magazine was also added then above the nave as a warehouse for merchants.
Following the Reformation, the church was transformed into a parish church for the town of Visby. All other churches were abandoned. Shortly after the Reformation, in 1572, Gotland was made into its own Diocese, and the church designated its cathedral.
There is not much left of the original interior. The font is made of local red marble in the 13th century. The pulpit was made in Lübeck in 1684. There are 400 graves under the church floor.