Career
His rule is documented from the year 1484. Joel represents one of last recorded kings of Christian Nubia. He is known from a graffiti in the Cathedral of Faras, the inscription in the Church of Tamit, the letter from Jebel Adda, which is dated to 1484 and an inscription from nearby Church.
This number of inscriptions and other references seems to be unusual, especially from times shortly before the Christian states in Nubia vanished.
So Joel certainly seems to have had some significance. lieutenant is reported that he had at least one vassal: king Tienossi of Ilenat.