ENThe topic of Henryk Sienkiewiczs connections with Lithuania is not yet fully developed. In addition to tangible, well documented information, there are numerous half-legendary stories having no confirmation in credible sources. Exploration of the Lithuanian archives can still produce interesting results also in this area. The materials left by Lucian Uziębło, a collector and a great lover of Vilnius, contain an unknown letter written by Henryk Sienkiewicz. It is the writers answer to a collectors offer of King Jan III Sobieskis calendar, with the Kings own notes.