The Abbasids contested leadership of the caliphate and overtook the Umayyads in what became known as the Abbasid Revolution in the mid-8th century. The leader of the Abbasid movement in Khurasan in northeastern Persia was a member of the Tayy, Qahtaba ibn Shabib. The tribe fared well during Abbasid rule. A prominent "akhbari" (transmitter of hadith) in the early 9th century was a Tayyid named al-Haytham ibn Adi (died 822). Two major poets from the Tayy also emerged in the 9th century: Abu Tammam and al-Buhturi. The former, who authored the "Hamasah" anthology, may not have been an actual member of the tribe, but had adopted the tribe as his own.