Abd-Allah Ibn Ubayy

Abd-Allah ibn Ubayy (Arabic: عبد الله بن أبي بن سلول‎, died 631), also called ibn Salul in reference to his mother, was a chief of the Arab tribe Banu Khazraj and one of the leading men of Medina (then known as Yathrib). Upon the arrival of Muhammad, Ibn Ubayy became a Muslim, though the sincerity of that conversion is disputed. Because of repeated conflicts with Muhammad, Islamic tradition has labelled him a Munafiq (hypocrite) and "leader of the Munafiqun".

Read more about Abd-Allah Ibn Ubayy:  Position in Medina, Conversion, Banu Qaynuqa, Battle of Uhud, Banu Nadir, Controversy During The Mustaliq Campaign, Last Years