The Visconti Castle of Binasco is famed for having been the prison of Beatrice di Tenda (Duchess of Milan and wife of Filippo Maria Visconti), who was arrested and there sentenced to death for adultery in 1418. Today it is the seat of the municipality of Binasco.
The castle originated from a stronghold built by the Visconti in the 14th century to take care of their land in the area. Probably between 1315 and 1319 the nearby church of Saint Stephan was founded and the castle built by Luchino Visconti, Lord of Milan. The first mention of a castle in Binasco dates back to 1329, when it was used by Azzone Visconti and his uncle Giovanni as a prison for their political opponents.
In the 17th century the castle underwent transformations and restorations. At the end of the 19th century it was sacked during the Napoleonic age and in 1869 hit by a ruinous fire. The current aspect is the result of subsequent restorations that gave back the sense of the ancient fortress. Two towers are still visible along the south front.
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The Church of St Donatus name refers to Donatus of Zadar, who began construction on this church in the 9th century and ended it on the northeastern part of the Roman forum. It is the largest Pre-Romanesque building in Croatia.
The beginning of the building of the church was placed to the second half of the 8th century, and it is supposed to have been completed in the 9th century. The Zadar bishop and diplomat Donat (8th and 9th centuries) is credited with the building of the church. He led the representations of the Dalmatian cities to Constantinople and Charles the Great, which is why this church bears slight resemblance to Charlemagne's court chapels, especially the one in Aachen, and also to the Basilica of San Vitale in Ravenna. It belongs to the Pre-Romanesque architectural period.
The circular church, formerly domed, is 27 m high and is characterised by simplicity and technical primitivism.