The canons to which the synodal fathers refer to were adopted at the Fourth Council of Arles (AD 524). From the letter of Pope Felix IV to Caesarius, which de Clercq added to the acts of the Council of Carpentras (de Clercq ed. 1963: 51-52), we learn that the ordination of Protadius was invalid because a layman before taking Holy Orders was obliged to live for a certain period of time a pious and ascetic life, and, almost certainly, abstain from sexual activity. This probation, called conversio, was to last according to canon 2 of the Fourth Council of Arles for one year (see [1165]). The punishment for the violation of this rule was described in canon 3 of the same council (see [1166]).
From the same letter of Pope Felix IV, we derive the information that Protadius was ordained a sacerdos, i.e. a presbyter.