Horn of Africa polity was succeeded by the Sultanate of Ifat around 1285. Ifat was governed from its capital at Zeila in northern Somalia and was the easternmost district of the former Shewa Sultanate. The Adal Sultanate was a medieval multi-ethnic Muslim state centered in the Horn region. At its height, it controlled large parts of Somalia, Ethiopia, Djibouti and Eritrea. Many of the historic cities in the region, such as Amud, Maduna, Abasa, Berbera, Zeila and Harar, flourished during the kingdom's golden age. This period that left behind numerous courtyard houses, mosques, shrines and walled enclosures. Under the leadership of rulers such
Horn (instrument) the mouthpiece is increased. But, although some pressure is needed, excessive pressure is not desirable. Playing with excessive pressure makes the playing of the horn sound forced and harsh as well as decreases endurance of the player by about half. The Vienna horn is a special horn used primarily in Vienna, Austria. Instead of using rotary valves or piston valves, it uses the Pumpenvalve (or Vienna Valve), which is a double-piston operating inside the valve slides, and usually situated on the opposite side of the corpus from the player's left hand, and operated by a long pushrod. Unlike the modern