Villalonso Castle is one of the best conserved castles in the province of Zamora. The castle is a typical and notable example of 15th-century architecture; its construction may be attributed to Juan de Ulloa and his wife María de Sarmiento, whose coats of arms can be seen above the entrance gate. It played an important role during the siege of the queen Isabel the Catholic on Toro during her war against Juan 'La Beltraneja' and during the comunero rebelion against Carlos V.
In 1235 there was an earlier fortification at this site belonging to the Order of Alcántara. During the wars of the Catholic Kings against the King of Portugal, Villalonso Castle, along with other castles in the area, was in the hands of Pedro de Avendaño, in the name of the Portuguese king. At that time the count of Marialba, having fled the town of Toro, sought refuge in the castle shortly before the conquest of this city by the Castilian forces. The castle also played a role, although of small importance, in the War of the Communities.
The castle consisted of two enclosures and a wide moat still visible although mostly covered up.The outside enclosure has not been preserved. The interior one has been partially preserves. It is square and has cubes in the corners and a Tower of Homage, also square, in the centre of one of the sides, topped with a beautiful running crenellation.
References: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.