Validation of marriage or convalidation of marriage is, in Roman Catholic canon law, making a putative marriage a valid one, after the removal of an impediment, or its dispensation, or the removal of defective consent. Once a putative marriage has been validated, it cannot be annulled. If the impediment to the marriage was a defective consent in one or both parties, a simple renewal of consent can effect validation. When, however, matrimony is invalid because of a diriment impediment, it may be revalidated by simple dispensation or by that known as Sanatio in Radice.