A more thorough explanation:

pallio cooperire

pallio cooperire is a Latin term that means "to cover with a pallium." In history, it referred to a marriage between two people who already had a child together. During the wedding ceremony, a veil or cover called a pallium was placed over the bride and extended to cover the illegitimate child. Removing the pallium at the wedding was seen as a way to legitimize the child.

An example of pallio cooperire would be a couple who had a child out of wedlock and then decided to get married. During the wedding ceremony, the bride would wear a pallium that covered both her and the child, symbolizing the legitimacy of the child.

Another example would be a historical figure like William the Conqueror, who was born out of wedlock but later legitimized through his parents' marriage. It's possible that a pallium was used during their wedding ceremony to symbolize this legitimacy.

These examples illustrate how pallio cooperire was used in history to legitimize children born out of wedlock and how the pallium was used as a symbol of this legitimacy during wedding ceremonies.