The Château d'Étampes was a castle in the town of Étampes. The principal remains are of the 12th-century keep, the Tour de Guinette.
The Château d'Étampes was an early 10th-century stronghold of Robert the Pious, King of France, that comprised both a palace proper and motte. Between 1130 and 1150, a new castle was created overlooking the valley, culminating in a strong keep or donjon: the present Tour de Guinette. The Château was extended under later kings, notably Philip II of France, but suffered through sieges in the Hundred Years War before having been ordered destroyed by Henry IV of France, after which only the keep remained.
The architectural aspects of this former royal castle are known from contemporary images, including the Très Riches Heures du duc de Berry. Tour de Guinette was in the center of the castle and was surrounded by a rectangular curtain wall punctuated by corner towers. This wall was, in turn, enclosed by two additional walls providing layers of defense for the keep.
The surviving keep stands roughly 27 meters tall and is a quatrefoil plan (much like a four-leaf clover). Divided into four stories, first-floor access may originally have been reached from the enclosure wall. This interesting plan is the result of tactical experimentation that the keep underwent during the mid-12th century to improve the defense of towers against missiles and to reduce dead ground. The circular lobes deflect missiles, and allow defenders to cover the foot of the walls from the summit of the keep. The plan resembles the keeps of Ambleny and nearby Houdan. Clifford's Tower, part of York Castle in York, England, is believed to have been inspired by Étampes.
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.