The Château de Montluc, named after its famous owner Blaise de Monluc, is located in Estillac, in the French department of Lot-et-Garonne. Built in the 13th century, it was expanded in the 16th century in a Renaissance style by the Mondenard family. Blaise de Monluc inherited it in 1544 and undertook major works, including the addition of defensive bastions inspired by Italian fortifications. He also planned a funerary chapel for himself. The castle was modified to withstand the religious wars but was partially demolished in 1793. Blaise de Monluc lived here to write his commentaries but died in 1577, leaving the estate to his grandson. Over the centuries, the castle changed hands and was classified as a historic monument in 1958. Its architecture features a trapezoidal plan with an almost triangular interior courtyard.
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.