Pope Urban II called for the 1st crusade because he received a letter from Alexios I Komnenos asking for help against the Seljuk Turks who had taken over large portions of his empire. This first unofficial wave of the first crusade is known as the people's crusade, led by Peter the Hermit and Walter the Penniless. The first battle of the first crusade was the battle of Dorylaeum in 1097. The official crusader army left from Le Puy, France in August of 1096 AD. Major players of the first crusade include Duke Godfrey, Hugh of France, Bohemond, and Raymond of Toulouse.