Originally , an-Nasr was a Byzantine church , and then the Templars constructed a small church which consisted of a circular building with a red dome during the Crusader rule of Palestine . The Crusaders lost Nablus in 1187 to the Ayyubids and by the 14th century Nablus was in Mamluk hands . The Mamluks transformed the Crusader church into the three-nave an-Nasr Mosque . The Ottomans built a government building adjacent to the mosque . An-Nasr was destroyed by an earthquake that struck Nablus in 1927
earthquake
1927 Jericho earthquake
An-Nasr Mosque