Welsh territory at one time encompassed the whole of Britain up to the central belt of Scotland.
https://twitter.com/DEADLIVEUK/statu...59568507211777

When Wales last had self rule they ruled an area greater than the current borders of Wales.
https://en.wikipedia.org/wiki/Gruffydd_ap_Llywelyn

This was agreed in 1405 and probably should be the map today.
https://twitter.com/welshnotbritish/...71350339911681