The Château de Lusignan (in Lusignan, Vienne département, France), of which hardly any traces remain, was the ancestral seat of the House of Lusignan, Poitevin Marcher Lords, who distinguished themselves in the First Crusade and became the royal family of the Kingdom of Jerusalem, the Kingdom of Cyprus and the Armenian Kingdom of Cilicia. Built in the 10th century, it reached its peak four centuries later, decayed and was finally dismantled in the 18th century. Castle, town nucleus, prison Construction of the castle, which eventually counted among the largest to be built in France, started during the second half of the 10th century under Hugh II of Lusignan (d. 967). This castle was dismantled during the 12th and then rebuilt in the 13th and again at the end of the 14th century. Lusignan was constructed in the region of Poitou, occupying a natural strongpoint, a narrow promontory that overlooked steep valleys on either side. It was already so impressive in the 12th century that a legend developed to the effect that its founder had faery aid, in the guise of the water spirit Melusine, who built it and its church through her arts, as a gift for her husband Raymondin. Lusignan at its height, just as it was in the early 15th century, is illustrated in the Très Riches Heures of Jean, duc de Berri, for whom it was a favourite residence until his death in 1416. It rises in the background of the miniature for the month of March (see illustration), clearly shown in perspective, with its barbican tower at the left, the clock tower — with the exterior chute of the garderobe to its right — and the Tour Poitevine on the right, above which the gilded dragon flies, the protective spirit of Melusine. After the duc de Berri's death, Lusignan became briefly the property of John, Dauphin (died May 1417) and then passed to his brother, Charles, the future Charles VII. First the village, then the town of Lusignan, grew up beneath the castle gates, along the slope. It formed a further enceinte (surrounding fortification) when it too was later enclosed by walls. Lusignan remained a strategically important place in Poitou, in the heart of France. During the French Wars of Religion, in 1574, a plan was made of the castle's defenses; it is kept in the Bibliothèque Nationale, Paris. In the following century Lusignan was reinforced