Read Donatism (Wikipedia)

Donatism (Latin: Donatismus, Greek: Δονατισμός Donatismós) was a heresy leading to schism in the Church of Carthage from the fourth to the sixth centuries AD. Donatists argued that Christian clergy must be faultless for their ministry to be effective and their prayers and sacraments to be valid. Donatism had its roots in the long-established Christian community of the Roman Africa province (now Algeria and Tunisia) in the persecutions of Christians under Diocletian. Named after the Berber Christian bishop Donatus Magnus, Donatism flourished during the fourth and fifth centuries.