Abbasids start with a settler + flip for historical reasons - 750 was the time of the Abbasid revolt and Baghdad was founded in 762. I really don't know what's causing these issues for you. Make sure that startingYear in CvRhyes.h is correct, and also tBirth in Consts.py is set to a special number (not the start date). In SoI it is 0. You can use -3000 BC but make sure the condition in setup method is changed from if tBirth[iLoopCiv] == 0: to ... == -3000; two similar changes have to be done in createEarlyStartingUnits.