 The Jarm (or Jurum) may have also been a branch of the Al al-Tha'alib.According to the 14th-century Arab historian and sociologist, Ibn Khaldun, the Tayy were among those Qahtanite tribes who lived in the hills and plains of Syria and Mesopotamia and intermarried with non-Arabs.Ibn Khaldun further stated that Tayyid tribesmen did "not pay any attention to preserving the (purity of) lineage of their families and groups".