Abnāʾ, or Banū al-Aḥrār, referring to the Abnāʾ peoples of Fārs, is the name for the descendants of a group of Persians who were sent on a military campaign to invade Yemen in order to assist Sayf b. Dhī Yazan, during the reign of Khusraw Anūshīrawān (r. 531–578/9). These people eventually settled in Yemen on a permanent basis.