The Donatists held that both Caecilian and his predecessor , Mensurius , had been traditors and thus the sacraments they administered were invalid .
Those who supported Donatus rather than Caecilian as Bishop of Carthage soon became known as the Donatists .
The Donatists held that both Caecilian and Caecilian 's predecessor , Mensurius , had been traditors and thus the sacraments Donatists administered were invalid .
Those who supported Donatus rather than Caecilian as Bishop of Carthage soon became known as the Donatists .