His works are mostly of a doctrinal character. He defended the
Trinitarian doctrines against the
Arians and dealt besides with the question of the
two natures in Christ, with
baptism, and with the
Eucharist. He drew up a "Breviatio Canonum Ecclesiasticorum" in which he summarized in two hundred and thirty-two canons the teaching of the earliest
ecumenical councils concerning the manner of life of bishops, priests, deacons and other ecclesiastics, and of the conduct to be observed towards
Jews, pagans and heretics. He also wrote at the request of the
Comes Reginus (who was probably military governor of North Africa) a treatise on the Christian rule of life for soldiers, in which he laid down seven rules which he explained and inculcated and gave evidence of his piety and practical wisdom.
Life of Fulgence of Ruspe Since Pierre Pithou wrote in 1588 he was generally considered the author of the
Life of Fulgence of Ruspe. However, this attribution is not based on any indication of the many manuscripts. Two letters of Ferrand about Fulgence are preserved, where he questions him on points of religion, and there are corresponding answers from Fulgence. At the end of a letter to the Abbe Eugippe, written just after the death of Fulgence ( 532 ), Ferrand evokes the projected drafting of a Life, but without positively saying the author. But one of the last editors of the text, Antonino Isola, casts doubt on his authorship to the point of talking about "Pseudo-Ferrand". and choosing to nominate Redemptus a monk of
Telepte as the author. The prologue of the Life mentions that the author lives in the little
monastery which
Bishop Fulgence had founded during his relegation to Sardinia; this, therefore, may or may not describe Ferrand.
Letters Also Ferrand preserves seven letters transmitted in bulk: the two by which he interrogates Fulgence de Ruspe (the first on the question of whether an Ethiopian catechumen, died while administered baptism, was saved, the second on dogma Of the Trinity and the question of whether the divinity of Christ suffered on the cross), and five others, some very long, which are true little treatises on theology (notably the answer to the deacons Pelagius and Anatolius on the Three Chapters, by which he pronounced against the edict of Justinian, or the very long letter to Count Reginus on the duties of a Christian officer, presented in the form of seven rules. The letter to Eugippe, formerly known in a truncated version (still reproduced in PL ), was published for the first time in its integral version in 1828 by Cardinal Angelo Mai, according to a manuscript of Mount Cassin. On the other hand, Ferrand is the author of the , a collection of 232 canons enacted by the oldest Greek and African councils, first published by Pierre Pithou. ==See also==