Bobastro is the ruins of an old castle in the Province of Málaga. The castle was of Roman origin, but rebuilt by Umar ibn Hafsun during his rebellion against the Caliphate of Cordoba in the 9th century.
There had been a structure at the site since Roman times. In 880 AD, Umar ibn Hafsun settled in the ruins of the old castle of Bobastro near Ardales, in which he incited the muwallads and mozarabs to join his cause against the unfair, heavy taxation and humiliating treatment they were receiving at the hands of Abd ar-Rahman II and his successors. The rebels constructed a church within the castle which lasted until the end of their autonomy on January 19, 928.
In 888 AD, Al-Mundhir of Córdoba was murdered at Bobastro by his brother Abdullah ibn Muhammad al-Umawi, who later succeeded him.
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.