Ferrandus says that he repeats the norm after a Council of Carthage and the "concilium Zelensis". The former remains unidentified. Such a norm was given at the Council of Carthage in 390 AD [132], repeated at the Council of Carthage in 401 AD [309], and in the Apiarian Canons [227] and [259].
he "concilium Zelensis", or rather "Thelense", gathered in an unknown place in North Africa in 418 AD and repeated the norms given by Pope Siricius at the Roman Council in 386 AD [276].