In Medieval Wales, prior to its conquest by and incorporation in England, a "bastard" was defined solely as a child not acknowledged by his father. All children acknowledged by a father, whether born in or out of wedlock, had equal legal rights including the right to share in the father's inheritance. This legal difference between Wales and England is often referred to in the well-known "Brother Cadfael" series of Medieval detective mysteries, and provides the solution to the mystery in one of them.