Khalaf al-Bazzar explained

Abu Muhammad Khalaf ibn Hisham ibn Tha'lab al-Asadi al-Bazzar al-Baghdadi, better known as Khalaf (150–229AH, -844CE),^[1] was an important figure in the history of the Qur'an and the Qira'at, or method of recitation. In addition to being a transmitter for the Quran reading method of Hamzah az-Zaiyyat,^{[2] [3]} one of the seven canonical readers, he was also known for his own independent method that is counted among the three accepted but less famous methods.^[3]

For Khalaf's own, independent method of recitation, the two primary transmitters from him were Ishaq al-Maruzi and Idris al-Haddad.^[4]

He died in the year 844CE.^{[3] [5]}

Notes and References

1. Scott C. Lucas, Constructive Critics, Hadith Literature, and the Articulation of Sunnī Islam, pg. 184. Leiden: Brill Publishers, 2005.
2. Claude Gilliot, Creation of a fixed text, pg. 51. Taken from The Cambridge Companion to the Qur'an by Jane Dammen McAuliffe. Cambridge: Cambridge University Press, 2006.
3. Muhammad Ghoniem and MSM Saifullah, The Ten Readers & Their Transmitters. (c) Islamic Awareness. Updated January 8, 2002; accessed April 11, 2016.
4. Shady Hekmat Nasser, Ibn Mujahid and the Canonization of the Seven Readings, p. 129. Taken from The Transmission of the Variant Readings of the Qur'an: The Problem of Tawaatur and the Emergence of Shawaadhdh. Leiden: Brill Publishers, 2012.
5. Shady Nasser, Canonization, pg. 49.