The Siege of Nicaea was a pivotal military confrontation that took place in 1097 during the First Crusade, where Crusader forces besieged the city of Nicaea, which was controlled by the Seljuk Turks. This siege marked a critical moment in the crusaders' journey to reclaim Jerusalem, as it not only demonstrated their military capabilities but also highlighted the complex interactions between various factions, including the Byzantine Empire and the Crusaders themselves.