Simonas Daukantas promoted a return to Lithuania's pre-Commonwealth traditions, which he depicted as a Golden Age of Lithuania and a renewal of the native culture, based on the Lithuanian language and customs. With those ideas in mind, he wrote already in 1822 a history of Lithuania in Lithuanian – ''Darbai senųjų lietuvių ir žemaičių'' (''The Deeds of Ancient Lithuanians and Samogitians''), though it was not published at that time. A colleague of S. Daukantas, Teodor Narbutt wrote in Polish a voluminous ''Ancient History of the Lithuanian Nation'' (1835–1841), where he likewise expounded and expanded further on the concept of historic Lithuania, whose days of glory had ended with the Union of Lublin in 1569. Narbutt, invoking German scholarship, pointed out the relationship between the Lithuanian and Sanskrit languages. A Lithuanian National Revival, inspired by the ancient Lithuanian history, language and culture, laid the foundations of the modern Lithuanian nation and independent Lithuania.