Great Lechia
The Great Lechia (Polish: Wielka Lechia), also known as the Lechite Empire, and Lechian Empire (Polish: Imperium Lechitów), is a name for a fictional country from a pseudohistorical conspiracy theory which argues that Poland, prior to its Christianization, was a vast empire whose existence is now denied as a result of its history being falsified. The theory was present in niche circles since the 19th century, and during the interwar period.