The Second Crusade occurred a little under a half a century after the First Crusade. The Second Crusade was primarily spurred on by a need to reinforce Jerusalem against Turkish Muslim invaders who threatened to retake the city from the Europeans who had conquered it during the First Crusade. Pope Eugene III urged Christians in Europe to aid Jerusalem.
Louis VII of France stopped by the Crusader principality of Antioch on his way to the second Crusade. The fact that the prince of Antioch was the uncle of Louis's wife, Eleanor of Aquitaine, didn't stop rumors of an affair between them.
Raynald of Châtillon (also Reynald, Reynold, Renald, or Reginald; French: Renaud de Châtillon, Old French: Reynaud de Chastillon; c. 1125 – 4 July 1187) was a knight who served in the Second Crusade and remained in the Holy Land after its defeat. Raynald was an enormously controversial character in his own lifetime and beyond; Muslim writers often took him to be the chief enemy of Islam.