Some of the first Marcher Lords, the Mortimers, were gifted large tracts of land by the Normans, to subdue the rebelling Welsh princes, to help ‘govern’ the Wesh Marhes and protect the English borders during the middle ages right up until the time of Henry the 8th.
Too far for organised WAG group visits, the Mortimer Society has a great website with vast amounts of information, seminars, and online talks recorded for all to follow without leaving the comfort of your home.
https://mortimerhistorysociety.org.uk
Whitchurch and Ganarew Local History Society 