Validity and liceity (Catholic Church) in the context of "Catholic canon law"

Independent Catholicism is an independent sacramental movement of clergy and laity who self-identify as Catholic (most often as Old Catholic or as Independent Catholic) and form "micro-churches claiming apostolic succession and valid sacraments", in spite of not being affiliated with the Catholic Church. The term "Independent Catholic" derives from the fact that "these denominations affirm both their belonging to the Catholic tradition as well as their independence from Rome".

It is difficult to determine the number of jurisdictions, communities, clergy and members who make up Independent Catholicism, particularly since the movement "is growing and changing in every moment". Some adherents choose Independent Catholicism as an alternative way to live and express their Catholic faith outside the Catholic Church (with whose structures, beliefs and practices Independent Catholicism often closely aligns) while rejecting some traditional Catholic teachings.

In the liturgical traditions of the Catholic Church, the term ordination refers to the means by which a person is included in one of the holy orders of bishops, priests, or deacons. The teaching of the Catholic Church on ordination, as expressed in the 1983 Code of Canon Law, the Catechism of the Catholic Church, and Ordinatio sacerdotalis (an apostolic letter), is that only a Catholic male validly receives ordination (ex opere operato), and "that the Church has no authority whatsoever to confer priestly ordination on women and that this judgment is to be definitively held by all the Church's faithful." In other words, the male priesthood is not considered by the church a matter of policy but an unalterable requirement of God. As with priests and bishops, the church ordains only men as deacons.

The Edwardine Ordinals are two ordinals primarily written by Thomas Cranmer as influenced by Martin Bucer and first published under Edward VI, the first in 1550 and the second in 1552, for the Church of England. Both liturgical books were intended to replace the ordination liturgies contained within medieval pontificals in use before the English Reformation.

The 1550 ordinal was authorized the year following the first Book of Common Prayer's introduction. The 1552 ordinal's introduction coincided with that of the second Book of Common Prayer. Both prayer books were also largely prepared by Cranmer. The ordinals provided the basis for most Anglican ordination rites until the 20th century and contributed to the development of the Anglican priesthood from "sacerdotal" and "intercessory" into a "preaching, catechizing, and protestant ministry". They also formed the basis for both the Vestiarian Controversy and, much later, some of the debate over the validity of Anglican holy orders and the subsequent 1896 papal bull Apostolicae curae where they were declared "absolutely null and utterly void" by the Catholic Church.