The Ajuran Empire, which was one of the largest and strongest empires in the Horn of Africa, began to decline in the 17th century, and several powerful successor states came to prominence. The Geledi Sultanate, established by Ibrahim Adeer, was a notable successor of the Ajuran Sultanate. The Sultanate reached its apex under the successive reigns of Sultan Yusuf Mahamud Ibrahim (reigned 1798 to 1848), who successfully consolidated Geledi power during the Bardera wars, and Sultan Ahmed Yusuf, who forced regional powers such as the Omani Empire to pay tribute. The Majeerteen Sultanate was a Somali Sultanate in the Horn of Africa. Ruled by King Osman Mahamuud during its golden age, it controlled much of northern and central Somalia in the 19th and early 20th centuries. The polity had all of the organs of an integrated modern state and maintained a robust trading network. Along with the Sultanate of Hobyo ruled by Sultan Yusuf Ali Kenadid, the Majeerteen Sultanate was eventually annexed into Italian Somaliland in the early 20th century, following the military Campaign of the Sultanates.