An important point - the Anglo-Welsh/Cymro-English frontier is mostly its own space which 'Offa's Dyke' sort of sits in the middle of. https://twitter.com/howardmrw/status/1260689308882817024

It's quite obvious, for example, that the late medieval 'State' was extremely vague about which was which (a fact regularly exploited by those who lived there). It wasn't new then...

Take for example, the lawyer implicated in declaring Owain Glyndwr prince of Wales in 1400. His defence was that the event took place in the March (just one name for that space) and thus the king's writ was irrelevant. This defence was successful [contuinues...]

You can see it in the multiple identities of residents of this zone by the 14th century and more so in the 15th. Henry Griffith, esquire of Ewyas could be 'of Wales', of the March of Wales, of Bacton, Herefordshire or, 'o Went' - of Gwent, without ever leaving his fireside [more]

Harri Ddu ap Gruffudd could express his character through praise poetry, as retainer of the Duke of York, as something of a thug and as effective lord of someone else's minor lordship. Euas/Ewyas was his as much as it was Welsh or English...