尼西亚围城战是第一次十字军东征期间的第一次重大战役，发生在1097年5月14日至6月19日。这座城市原本处于塞尔柱突厥人的控制之下，但是他们选择向拜占庭人投降，因为他们害怕十字军进入这座城市。围攻之后是多利留姆战役和安条克围城战。
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Nicolle, The First Crusade 1096-1099: Conquest of the Holy Land, p. 32 "Eventually the Crusader forces outside Nicaea numbered around 4,200–4,500 cavalry and 30,000 infantry, excluding non-combattants."
Crusades: The Illustrated History, by Thomas F. Madden
Pryor, Logistics of Warfare in the Age of the Crusades, pp. 49–50 "In addition, the besiegers made several efforts to storm the walls and they won a victory in pitched battle over the relieving army of Qilij Arslan, a force some 10,000 troops, mostly mounted archers."
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- Fulcher of Chartres, Historia Hierosolymitana
- Gesta Francorum (anonymous)
- Raymond of Aguilers, Historia francorum qui ceperunt Jerusalem
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