Brycheiniog was then converted into a lordship marcher and passed to the Fitzwalter, de Breos, the Bohun and the Stafford families in succession, remaining unaffected by the Statute of Rhuddlan (1282), as it formed part of the marches, and not of the principality of Wales.
By the Statute, or rather Ordinance of Rhuddlan, promulgated in 1284, many important changes were effected in the civil administration of Wales.
At the Conquest Wallasey formed part of the possessions of Robert de Rhuddlan, and on his decease became part of the fee of Halton.
The statute of Wales, issued at Rhuddlan in 1284, provided for the introduction of English law into the country, though a certain amount of Celtic customs was allowed to survive.
The chronicler Benedictus Abbas calls David rex, and Rhuddlan castle was probably the centre of his vague authority.