From the outset, patristic literature witnesses to this hierarchical and ministerial structure in the Church, which includes the diaconate.  St. Ignatius of Antioch considers a Church without bishop, priests or deacon, unthinkable. He underlines that the ministry of deacons is nothing other than ”the ministry of Jesus Christ who was with the Father before time began and who appeared at the end of time”. They are not deacons of food and drink but ministers of the Church of God. The Didascalia Apostolorum, the Fathers of subsequent centuries, the various Councils, as well as and ecclesiastical praxis, all confirm the continuity and development of this revealed datum.      

Up to the fifth century the Diaconate flourished in the western Church, but after this period, it experienced, for various reasons, a slow decline, which ended in its surviving only as an intermediate stage for candidates preparing for priestly ordination.                                                    

The Council of Trent disposed that the permanent Diaconate, as it existed in ancient times, should be restored, in accord with its proper nature, to its original function in the Church. This prescription, however, was not carried into effect.

The second Vatican Council established that “it will be possible for the future to restore the diaconate as a proper and permanent rank of the hierarchy” (and confer it) even upon married men, provided they be of more mature age, and also suitable young men for whom, however, the law of celibacy must remain in force” in accordance with constant tradition. Three reasons lay behind this choice: (i) a desire to enrich the Church with the functions of the diaconate, which otherwise, in many regions, could only be exercised with great difficulty; (ii) the intention of strengthening with the grace of diaconal ordination those who already exercised many of the functions of the Diaconate; (iii) a concern to provide regions, where there is shortage of clergy, with sacred ministers.  Such reasons make clear that the restoration of the permanent Diaconate was in no manner intended to prejudice the meaning, role or flourishing of the ministerial priesthood, which must always be fostered because of its indispensability.

With the Apostolic Letter, Sacrum diaconatuus ordinem, of 18 June 1967, Pope Paul VI implemented the recommendations of the Second Vatican Council by determining general norms governing the restoration of the permanent Diaconate in the Latin Church.  The Apostolic Constitution Pontificalis Romani Recognitio  of 18 June 1968 approved the new rite of conferring the Sacred Orders of the Episcopate, the Presbvterate and the Diaconate and determined the matter and form of these sacramental ordinations.  Finally, the Apostolic Letter, Ad pascendum, of 15 August 1972 clarified the conditions for the admissions and ordination of candidates to the diaconate.  The essential elements of these norms subsequently passed in the Code of Canon Law promulgated by Pope John Paul II on 25 January 1983.

In the wake of this universal legislation, several Episcopal Conferences, with the prior approbation of the Holy See, have restored the permanent Diaconate in their territories and have drawn up complementary norms for its regulation.