Starting country is Desmond, a OPM irish nation. Form Ireland, and form Great Britain.

Managed to achieved EU4 Achievement : Luck of the Irish (game date october 1585), but with some country form a coalitions againts me 🙁 France, Burgundy, Denmark etc
Own and have cores on the British Isles as an Irish nation.

Decided to form Great Britain next. Reforming to GB have its perk, most of the country left the coalitions. Only France still in the coalitions, alone 😀

Achieved EU4 Achievement: An Industrial Evolution at game date August 1614.