In the early modern period, successor states to the Adal Sultanate began to flourish in Somaliland. These included the Isaaq Sultanate and Habr Yunis Sultanate. The Isaaq Sultanate was a Somali kingdom that ruled parts of the Horn of Africa during the 18th and 19th centuries. It spanned the territories of the Isaaq clan, descendants of the Banu Hashim clan, in modern-day Somaliland and Ethiopia. The sultanate was governed by the Rer Guled branch established by the first sultan, Sultan Guled Abdi, of the Eidagale clan. The sultanate is the pre-colonial predecessor to the modern Republic of Somaliland.