e authority of the king became more religious than secular and thus was less effective and constantly challenged by powerful noblemen. Thus was established feudalism in France. Over time, some of the king's vassals would grow so powerful that they often posed a threat to the king. For example, after the Battle of Hastings in 1066, the Duke of Normandy added "King of England" to his titles, becoming both the vassal to (as Duke of Normandy) and the equal of (as king of England) to the king of France.
The Carolingian dynasty ruled France until 987, when Hugh Capet, Duke of France and Count of Paris, was crowned King of France. His descendants, the Direct Capetians, the House of Valois and the House of Bourbon, progressively unified the country through a series of wars, such as the Saintonge War, and dynastic inheritance into the Kingdom of France. French knights took an active part in many of the Crusades that were fought between 1095 and 1291 to restore Christian control over the Holy Land. Crusaders were so predominately French that the word "crusader" in the Arabic language is simply known as Al-Franj or "The Franks" and Old French became the lingua franca of the Kingdom of Jerusalem.
The Albigensian Crusade was launched in 1209 to eliminate the heretical Cathars in the south-western area of modern-day France. In the end, the Cathars were exterminated and the autonomous County of Toulouse was annexed into the kingdom of France. Later Kings expanded their territory to cover over half of modern continental France, including most of the North, Centre and West of France. Meanwhile, the royal authority became more and more assertive, centred around a hierarchically conceived society distinguishing nobility, clergy, and commoners.
Charles IV (The Fair) died without an heir in 1328. Under the rules of the Salic law adopted in 1316, the crown of France could not pass to a woman nor could the line of kinship pass through the female line. Accordingly,
