 The Abbasid palace at al-Ukhaidir employed pointed arches in 778 as a dominant theme both structural and decorative throughout the façades and vaults of the complex, while the tomb of al-Muntasir, built 862, employed a dome with a pointed arch profile.Abbasid Samarra had many pointed arches, notably its surviving Bab al-ʿAmma (monumental triple gateway).By the 9th century the pointed arch was used in Egypt and North Africa