ʿAlī ibn ʾAbū'l-Hayjāʾ ʿAbdallāh ibn Ḥamdān ibn Ḥamdūn ibn al-Ḥārith al-Taghlibī, more commonly known simply by his honorific of Sayf al-Dawla, was the founder of the Emirate of Aleppo, encompassing most of northern Syria and parts of the western Jazira.

The Arabic title al-Dawla means 'dynasty' or 'state', and appears in many honorific and regnal titles in the Islamic world. Invented in the 10th century for senior statesmen of the Abbasid Caliphate, such titles soon spread throughout the Islamic world and provided the model for a broad variety of similar titles with other elements, such as al-Din.