Here's an East-West slice across Cymru (Wales) - in GOLD color
published 1573 - 1580 (from British Library)
The border with England was defined by the eastern banks of the River Dee (running north) and the Severn - Sabrina -
(running to the south).
Scroll down till you have "DO LHV" resting near the bottom, then scroll right till you run out of the GOLD.
About 10 miles (2 inches) west of border you'll see a picture of houses and a spire with 2 names:- "Croys Oswald" - Oswald's Cross in Welsh, with English version - "Oswestree" - Oswald's Tree
About 20 miles (4 inches) to S-E lies Shrewsbury - nearest English military town (castle with a flag), with 3 versions of its name i) "Ymwythig" - (Welsh), ii) "Shreusbury" - (English), iii) Salopia - (pseudo-French; the English elite thought it sounded "posh" - they didn't know "saloperie" meant 'filthiness' in French).