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Want some really obscure Irish political history trivia? The Ecology Party of Ireland was the only political party formed in 20th century Ireland whose first chair was a committed Esperantist. https://twitter.com/sendboyle/status/1334474222077419522
An early idea for my undergrad dissertation was a political history of Esperanto in Ireland. I dropped it due to a dearth of relevant sources, but there's a part of my brain permanently reserved for Irish Esperanto facts.
You can find a minor undercurrent in early 20th century Irish nationalism discussing how learning Esperanto could decolonise language in Ireland. The idea was that everyone in Ireland would learn Irish as first language and relate to the wider world through Esperanto, not English
It was an idea tied to the fortunes of Esperanto itself, though it did resurface every so often. See this 1932 article from the republican journal An Phoblacht: https://twitter.com/MauriceJCasey/status/880362514776809473?s=20
