This article explores the history of the study of the ancient Turkic manuscript Codex Cumanicus. This ancient Turkish monument is preserved today in the Marchana National Library in Venice, Italy. The article compares the research conducted on the monument. The result showed that the works of Hungarian G. Kuun, French scientist Drimba, Ukrainian scientist Garkavets, Turkish scientists M. Argunshah and G. Guner have been recognized and motivated many studies. Each of them translated the manuscript into their native languages. B. Jafarov, one of the Uzbek scientists, also created a blessing on the manuscript. He translated the first part of it into Uzbek language in order to convey it to Uzbek readers. The research work of these and other scientists is widely covered in the article.