TBF if you’re going to include all the countries that no longer exist on this map, it’d be unreadable.

Off the top of my head (and in no particular order): all the small states in the Holy Roman Empire, the Holy Roman Empire, the Roman Empire, the Western Roman Empire, Dacia, Poland-Lithuania, Scotland, England, the Kingdom of Ireland, Wales, Burgundy, Al-Andalus, Czechoslovakia, the DDR, Yugoslavia, Byzantium, the Ottoman Empire, Austro-Hungaria, the Irish Kingdoms, etc.