The Jalali calendar in 1079 C.E. & its cohabitation with the old Persian calendar- Johannes Thomann

Under the Saljuqid ruler Jalal al-Dawla Malik-Shah (died 1092 C.E.) a new calendar with the era 15 March 1079 was introduced. Up to this time, the old Persian calendar with a fixed year of 365 days was still in use, and the first regnal year of Yazdagird III (632 C.E.) served as its epoch. Explored here is the relationship of the two calendars, their use and their symbolic significance in the late Saljuq epoch and beyond.