Their father , Caliph Harun al-Rashid , had named Name_conferral al-Amin as the first successor , but had also named Name_conferral al-Ma'mun as the second , with Khurasan granted Giving to him as an appanage .

Complexities of enfeoffment and dynastic `` appanage '' magnified Expansion a localized feud into one including supporters from the Electorate of the Palatinate and Dutch , Scots and English mercenaries on the Protestant side , and Bavarian and papal mercenaries on the Catholic side .