Lombards
As in the first crusade, the pilgrims and soldiers did not leave as a part of one large army, but rather in several groups from various different regions from across Western Europe. In September 1100, a large group of Lombards left from Milan. These were mostly untrained peasants, led by Anselm IV, Archbishop of Milan. When they reached the territory of the Byzantine Empire, they pillaged it recklessly, and Byzantine emperor Alexius I escorted them to a camp outside Constantinople. This did not satisfy them, and they made their way inside the city where they pillaged the Blachernae palace, even killing Alexius' pet lion. The Lombards were quickly ferried across the Bosporus and made their camp at Nicomedia, to wait for reinforcements.
At Nicomedia they were joined in May 1101 by a smaller but stronger contingent of French, Burgundians, and Germans, under Stephen of Blois, Stephen I, Count of Burgundy, Eudes I, Duke of Burgundy, and Conrad, constable of Henry IV, Holy Roman Emperor. Joining them at Nicomedia was Raymond IV of Toulouse, one of the leaders of the First Crusade who was now in the service of the emperor. He was appointed overall leader, and a Byzantine force of Pecheneg mercenaries was sent out with them under the command of General Tzitas. This group marched out at the end of May, towards Dorylaeum, following the route taken by Raymond and Stephen in 1097 during the First Crusade. They planned to continue towards Konya, but the Lombards, whose rabble outnumbered all the other contingents, were determined to march north to Niksar where Bohemond I of Antioch was being held captive by the Danishmends. After capturing Ancyra on June 23, 1101, and returning it to Alexius, the crusaders turned north. They briefly besieged the heavily garrisoned city of Gangra, and then continued north to attempt to capture the Turkish-controlled city of Kastamonu. However, they came under attack from the Seljuq Turks who harassed them for weeks, and a foraging party was destroyed in July.
At this point, under the threats of the Lombards, the entire army turned away from the possible safety of the Black Sea coast and again moved east, toward Danishmend territory and the rescue of Bohemond. However, the Seljuqs, under Kilij Arslan I, realizing that disunity was the cause of their inability to stop the First Crusade, had now allied with both the Danishmends and Ridwan of Aleppo. In early August the crusaders met this combined Muslim army at Mersivan.
Read more about this topic: Crusade Of 1101