Xerigordon was a castle in today's Turkey, which served as a setting for the Siege of Xerigordon as a part of the People's Crusade in 1096. The contemporary records assert that the fortress was located on a hill  and its water supply came from both a water well and a spring just outside the walls. The exact location has not yet been identified; some achaeologists place it about three miles away from Nicaea.
- Runciman, Steven (1994-01-01). A history of the Crusades. Folio Society.
- Setton, Kenneth Meyer (1969-01-01). A History of the Crusades: The first hundred years, edited by M. W. Baldwin. Univ of Wisconsin Press. ISBN 9780299048341.