Haamstede Castle (Slot Haamstede) was built originally in the 12th century and it probably consisted of a wooden keep on a motte, circled by a moat. There is also archeological evidence of Roman habitation on this site. Around 1200 this castle came into the possession of Floris IV, Count of Holland. In 1229 the castle went to the Lords of Zierikzee through an exchange with Floris IV. The new inhabitants of the castle called themselves Van Haamstede.
The castle was destroyed by fire in 1525. Only the keep, built in the 13th century, survived. The other castle was rebuilt in the 17th century. The keep was provided with 2 square towers on both sides. The smallest one served as a stair tower. During the 19th and 20th century the castle was renovated twice until it got its present appearance.
At present Haamstede Castle is owned by the Vereniging Natuurmonumenten, a society for the preservation of nature monuments in the Netherlands.
References:
Sigmaringen Castle was first mentioned in the year 1077 in the chronicles of Petershausen monastery. The oldest parts of the castle are concealed beneath the alterations made during the 17th and the 19th centuries. The secret of the earliest settlement built on this defendable rock will never be fully revealed: large-scale excavation work would be necessary, which the extensive land development renders impossible. Judging from the many Roman remains unearthed in the area around Sigmaringen, the 12th century keep known as the 'Roman Tower' could be traced back to a Roman predecessor.
The castle remains that have been preserved (gate, great hall and keep) date back to the Staufer period around 1200. The castle remains were integrated into subsequent buildings. The foundations of the castle buildings are to a large extent identical to the surrounding castle wall.
These remains give us a good idea of how the castle might have looked during the 12th century.