The ancient nation of Iblydos was said to be the oldest known human civilizations in Casmaron. Little information has survived to modern times, except that it was located on the southwestern shores of the Castrovin Sea, and included small cults of cyclops-worshipers.
- Steven Schend. (2010). Iobaria Gazetteer. The Varnhold Vanishing, p. 55. Paizo Publishing, LLC. ISBN 978-1-60125-234-0
- Erik Mona et al. (2008). Campaign Setting, p. 153. Paizo Publishing, LLC. ISBN 978-1-60125-112-1
- Colin McComb, F. Wesley Schneider, and Neil Spicer. (2010). Bestiary. The Varnhold Vanishing, p. 85. Paizo Publishing, LLC. ISBN 978-1-60125-234-0