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Abu Ayyub al-Ansari — born Khalid ibn Zayd ibn Kulayb ibn Tha'laba in Yathrib — was from the tribe of Banu Najjar, was a close companion and the standard-bearer of the Islamic prophet Muhammad. Abu Ayyub was one of the Ansar of the early Islamic history, those who supported Muhammad after the hijra (migration) to Medina in 622. The patronym Abu Ayyub, means father (abu) of Ayyub. Abu Ayyub died of illness during the First Arab Siege of Constantinople.