Nikolay Petrovich Rezanov (1764 – 1807) was a Russian nobleman and statesman who promoted the project of Russian colonization of Alaska and California to three successive Tsars—Catherine the Great, Paul, and Aleksander I. Aleksander I commissioned him as Russian ambassador to Japan (1804) to conclude a commercial treaty. In order to get there he was appointed co-commander of the First Russian circumnavigation (1803-1806), led by Adam Johann von Krusenstern. Rezanov departed the expedition when it reached Kamchatka after visiting Japan where he was unsuccessful in his ambassadorial mission. He was also the author of a lexicon of the Japanese language and of several other works, which are preserved in the library of the Saint Petersburg Academy of Sciences, of which he was a member. Rezanov's biggest legacy was the great Russian American Company.