Robert "Musa" Cerantonio is a former ISIS propagandist who has been called perhaps "the most famous jihadist in Australia". Cerantonio converted to Islam in 2002, he became an Islamic preacher a few years later, then a supporter of the restoration of the caliphate, and of the Islamic State. He has been arrested and deported once, and is currently serving a prison sentence for trying to travel by boat from Australia to ISIS territory in the southern Philippines due for release in May 2023.