Wahb ibn Munabbih
Prophet Mohammed sent his cousin Ali to Sana'a and its surroundings around 630 AD. At the time, Yemen was the most advanced region in Arabia. The Banu Hamdan confederation were among the first to accept Islam. Mohammed sent Muadh ibn Jabal as well to Al-Janad in present-day Taiz, and dispatched letters to various tribal leaders. The reason behind this was the division among the tribes and the absence of a strong central authority in Yemen during the days of the prophet. Major tribes, including Himyar, sent delegations to Medina during the "Year of delegations" around 630–631. Several Yemenis had already accepted Islam, including Ammar ibn Yasir, Al-Ala'a Al-Hadrami, Miqdad ibn Aswad, Abu Musa Ashaari and Sharhabeel ibn Hasana. A man named 'Abhala ibn Ka'ab Al-Ansi expelled the remaining Persians and claimed to be a prophet of Rahman. He was assassinated by a Yemeni of Persian origin called Fayruz al-Daylami. Christians, who were mainly staying in Najran along with Jews, agreed to pay Jizya, although some Jews converted to Islam, such as Wahb ibn Munabbih and Ka'ab al-Ahbar.