事件伊斯兰教632–661632–661 CE
四大哈里发时期（拉希敦）The Rashidun (Rightly Guided) Caliphate Period
艾布·伯克尔、欧麦尔、奥斯曼、阿里时期。H 轨：继承危机、征服与内战（菲特奈）；T 轨：逊尼「正统哈里发」与什叶对阿里优先的分流圣史。Abu Bakr, Umar, Uthman, Ali. H-track: succession crises, conquests, civil war (fitna); T-track: Sunni rightly guided caliphs vs Shi'i priority of Ali.