Additional Notes

A book by Michael Reed titled: The Making of Britain , The Age of Exuberance 1550 - 1700 , contains a number of thoughts that seem important to place in this discussion.  On pages 19 - 21, he discusses the Act of Union and a number of factors not previously presented.  He states that the Act of Union took some time for the details to be applied.  He notes that the first Welsh Justices of the Peace appear in 1541, and it was not until March of 1543 a complete list of Justices for all the Welsh counties appears.  From this point forward, the laws of England were place as the authority in Wales.
The 12 counties in Wales were placed into 4 sets of three, and a Justices for each group was organized.  The work of these Justices were under the supervision of the Court of Great Sessions.  A Council of The Marches was held in Ludow and had a superior jurisdiction.  This authority extended to Shropshire, Herefordshire, Worcestershire, and Gloucestershire.

The cover to my copy is shown.  It was first published 1986 by Routledge & Kegan Paul, London.

Power and Authority (36)

The Act of Union continues from post (35)...

"c6. Item, that every of the said Justices of Wales shall have power and authority to enquire of all treasons, murders, felonies, riots, routs, unlawful assemblies, extortions, embraceries, maintenances, retainers, concealments, contemps, and all other offences and evil deeds, of what natures, names or qualities soever they be, done, committed or perpetrated within the limits of their commissions and authorities, against the form of the Common Law of the realm of England, or of any statutes of the same, and to hear and determine the premisses, and every of them, and generally to minister common justice to all and singular the king's subjects within the limits of their commissions and authorities, according to the laws, statutes, and customs of the realm of England, and according to this present ordinance."

Justices (35)

The Act of Union 1536 continues from post (34)...

"c5. That every of the said Justices within the limits of their commissions and authorities to them appointed as is aforesaid, shall hold all manner of pleas of the crown at and in the said Sessions, in as large and ample manner as the King's Chief Justices of the King's Bench there, or any of them, may do in their places, or elsewhere within the realm of England; and also to hold pleas of assises, and all other pleas and actions real, personal, and mixed, in as large and ample manner as the King's Chief Justice of the Common Place in England, and other Justices of the same Place, or any of them, may do in the realm of England."