Zahir al-Umar al-Zaydani, alternatively spelled Daher el-Omar or Dahir al-Umar (Arabic: ظاهر العمر الزيداني, romanized: Ẓāhir al-ʿUmar az-Zaydānī, 1689/90 – 21 or 22 August 1775), was an Arab ruler of northern Palestine in the mid-18th century, while the region was part of the Ottoman Empire. For much of his reign, starting in the 1730s, his domain mainly consisted of the Galilee, with successive headquarters in Tiberias, Deir Hanna and finally Acre, in 1750. He fortified Acre, and the city became the center of the cotton trade between Palestine and Europe. In the mid-1760s, he reestablished the port town of Haifa nearby.
Zahir withstood sieges and assaults by the Ottoman governors of Damascus, who attempted to limit or eliminate his influence. He was often supported in these confrontations by the Shia Muslim clans of Jabal Amil. In 1771, in alliance with Ali Bey al-Kabir of the Egypt Eyalet and with backing from Russia, Zahir captured Sidon, while Ali Bey's forces conquered Damascus, both acts in open defiance of the Ottoman sultan. At the peak of his power in 1774, Zahir's rule extended from Beirut to Gaza and included the Jabal Amil and Jabal Ajlun regions. By then, however, Ali Bey had been killed, the Ottomans entered into a truce with the Russians, and the Ottoman imperial government felt secure enough to check Zahir's power. The Ottoman Navy attacked his Acre stronghold in the summer of 1775 and he was killed outside of its walls shortly after.
