Abu Bakr Dulaf ibn Jahdar al-Shibli (247/861-334/946) was a great Sufi of the Baghdad school who abandoned a governorship for the mystical path and reached maturity under Junayd al-Baghdadi. Junayd called him "the crown of the Sufis"; he was renowned for his profound utterances on gnosis and divine unity, for his ecstatic paradoxes, and as a close companion of al-Hallaj. He is the link after Junayd in the Qadiri chain; his tomb lies in the Khayzuran Cemetery in Baghdad's al-A'zamiyah district, though its precise coordinates lack a second independent source. (Source: TDV Encyclopedia of Islam "Şiblî, Ebû Bekir"; al-Qushayri, al-Risala.)