Battles/Sieges of the First Crusade

In 1097 the armies of the first crusade along with a force with the Byzantine Emperor Alexius re-captured Nicea. Then the crusaders went on to defeat the Seljuks not long after the surrender of Nicea. WI: (1) For one reason, or another, the siege of Nicea fails, and the crusaders are defeated, but Alexius manages to successfully withdraw. Or (2): Nicea is recaptured but the crusaders are defeated by the Seljuks at Dorylaeum. Does Alexius continue the Turkish war alone or are the remaining Byzantine areas of Asia Minor eventually conquered by the Seljuks?
 
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