Studies on Islam in Ethiopia have long been neglected although Islam is the religious confession of almost half of the Ethiopian population. The essays focus on the following topics: Islamic Principalities in Southeast Ethiopia between the 13th and 16th Century * Notes on the Islamization and the Muslim Shrines of the Harar Plateau * The Sanctuary of Shaikh Husayn and the Oromo-Somali Connections in Bale * The Islamization of the Arsi-Oromo; Medieval Muslim Survivals as a Stimulating Factor in the Re-Islamization of Southeastern Ethiopia. The essays are based on the study of written records and on field research in southern parts of the country carried out during the first half of the 1970s.