The Castle of Guimarães was built under the orders of Mumadona Dias in the 10th century to defend the monastery from attacks by Moors and Norsemen. At the end of the 11th century the castle was heavily expanded and remodeled, under the direction of Count Henry, to act as his residence. The castle became the official royal residence from 1139, when Portugal became independent from the Kingdom of León, until circa 1200.
Between the end of the 13th and beginning of the 14th century, the castle was remodelled by King Denis, resulting in the form that stands to this day. In 1369, King Henry II of Castile invaded Portugal and encircled the castle of Guimarães, but was defeated by its population and forces. Sometime between 1383 and 1433, the two towers that flank the main entrance were order built by King John I of Portugal.
After the castle's demolition was abandoned in the 19th century, many of the houses, estates and lodgings around the castle were expropriated. The first attempts at restoration occurred during the mid-20th century.
Today Guimarães castle area is delineated by walls forming a pentagram, similar to a shield, that includes eight rectangular towers, military square and central keep. Originating in the foundations of a Roman structure, from the writings of Alfredo Guimarães, it was later elaborated on the French model, in its current the form of a shield, with reduced central yard and difficult accesses. It includes several Gothic characteristics, owing to its remodelling at the end of the 13th century, when the keep and residences were constructed (possibly over pre-existing structures).
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.