Had Owain Glyndwr's rebellion against the English had been successful a "Teyrnas Cymru" (Kingdom of Wales) encompassing Wales and parts of Western and Central England.
- Rhenish Republic (1923-1924 - not very likely)
For the benefit of AH-kind I would like to start up an effort to compile, for comprehensive purposes, a compendium of Nations, States/Provinces, Territories, etc that were close to being or had the real prospect of coming into being, but never were, or for nations, states/provinces, territories, etc that could have been different.