World's first, and still unsurpassed, dictionary of the Yakut language was written by a Polish exile in Yakutia by the name of Edward Piekarski. His life has been analysed in several studies from Poland, be it often superficially and without own work in the archives, but his dictionary has hardly been addressed at all. The present paper collects bographic information from various sources , highlighting the discrepancies between them, and for the first time in the linguistic literature analyses Piekarski's views on the transcription of Yakut phonetics with an alphabet contrived by Otto von Böhtlingk about half a century before the creation of the Dictionary.