When the Widow of a Duke marries a person of lower rank than that of her late husband, she still retains her precedency.
The Daughter of a Peer if married to a baronet or a commoner retains her precedency, but if married to a baron her precedency is merged in that of her husband.
The Widow of a Baronet married to a commoner retains her title by right and not by courtesy.
The Widow of a Knight married to a commoner retains her title by courtesy only, but the precedency due to the widow of a knight is accorded to her.
When the Daughter of a Duke marries a peer she takes the precedency due to the rank of her husband; if she marries a commoner, precedency is accorded to her due to the daughter of a duke.