Catholic marriage, also called matrimony, is a "covenant by which a man and a woman establish between themselves a partnership of the whole of life and which is ordered by its nature to the good of the spouses and the procreation and education of offspring. [It] has been raised by Christ the Lord to the dignity of a sacrament between the baptised." In the Roman Rite

Roman Rite

The Roman Rite is the liturgical rite used in the Diocese of Rome in the Catholic Church. It is by far the most widespread of the Latin liturgical rites used within the Western or Latin autonomous particular Church, the particular Church that itself is also called the Latin Rite, and that is one of...

, it is ordinarily celebrated in a Nuptial Mass.

The nature of the covenant requires that the two participants be one man and one woman, that they be free to marry, that they willingly and knowingly enter into a valid marriage contract, and that they validly execute the performance of the contract.

On the exact definition of each of these steps hinge all the arguments and technical points involved in annulment

Annulment

Annulment is a legal procedure for declaring a marriage null and void. Unlike divorce, it is usually retroactive, meaning that an annulled marriage is considered to be invalid from the beginning almost as if it had never taken place...

s, and annulment disputes (e.g., one of the most famous, that of Henry VIII

Henry VIII of England

Henry VIII was King of England from 21 April 1509 until his death. He was Lord, and later King, of Ireland, as well as continuing the nominal claim by the English monarchs to the Kingdom of France...

).