From Kook Science
Turbosłowianizm (English: "Turboslavism"), also known as Turbolechianism, is an alternative historical hypothesis that posits the existence of a Polish state known as Imperium Lechitów ("Lechite Empire") or Wielkiej Lechii ("Great Lechia"), supposed to have encompassed at its peak a territory that stretched from the river Rhine (or Loire) eastward to the Ural mountains, and from the northern Baltic Sea southward to the Adriatic and the Black Seas, and which existed from a period of antiquity, stood in opposition to the Roman Empire, and continued on until the reign of Mieszko, who converted to Roman Catholicism and acceded to the authority of the Holy Roman Empire in 966 AD, after which the Lechite state was suppressed and erased from history by various actors, typically including the Germans, the Christians, and the Jews. A principal proponent of the hypothesis has been Janusz Bieszk, who authored the 2015 book Słowiańscy królowie Lechii ("Slavic Kings of Lechia"), outlining claims based on the Kronice Prokosza ("Chronicle of Prokosz"), an alleged 10th century manuscript that is generally supposed to have been a forgery.
- Bieszk, Janusz (2015) (in Polish), Słowiańscy królowie Lechii, Warszawa: Wydawnictwo Bellona
- Bieszk, Janusz (2016) (in Polish), Chrześcijańscy Królowie Lechii, Warszawa: Wydawnictwo Bellona
- Bieszk, Janusz (2017) (in Polish), Królowie Lechii i Lechici w dziejach, Warszawa: Wydawnictwo Bellona