Bābak Khorramdin (Persian: بابک خرمدین, Bābak-e Khorramdin, from Middle Persian "Pāpak"/"Pābag", meaning "Young Father"; 795 or 798 – January 838) was one of the main Iranian revolutionary leaders of the Iranian[5] Khorram-Dinān ("Those of the joyous religion"), which was a local freedom movement fighting the Abbasid Caliphate. Khorramdin appears to be a compound analogous to dorustdin "orthodoxy" and Behdin "Good Religion" (Zoroastrianism)