During the calmer periods of the late 15th and early 16th centuries, the Castillon plain on the banks of the Dordogne saw a development in urban architecture. The finest Gothic and Renaissance residences were built in Périgueux, Bergerac, and Sarlat. In the countryside, the nobility erected the majority of the more than 1200 chateaux, manors and country houses. In the second half of the 16th century, however, the terrors of war again visited the area, as the attacks, pillaging, and fires of the Wars of Religion reached a rare degree of violence in Périgord. At the time, Bergerac was one of the most powerful Huguenot strongholds, along with La Rochelle. Following these wars, Périgord, fief of Henry of Navarre, was to return to the Crown for good and would continue to suffer from the sudden political changes of the French nation, from the Revolution to the tragic hours of the Resistance.