Who was Syria’s Al-Nusra founder Abu Maria Al-Qahtani?

Abu Maria Al-Qahtani was the founder of Al-Nusra Front, one of the key groups in Syria’s war, and was killed in bombing on Thursday.
As a leading military commander in the revolt against the Syrian regime and Islamic State group, Abu Maria Al-Qahtani, who was killed on Thursday, was a divisive figure within the Islamist wing of the insurgency.