HSE University researchers Feodor Uspenskij and Anna Litvina studied the notes of Georg Tectander, a diplomat of the Holy Roman Empire, as collected in the book The Travel to Persia through Muscovy: 1602–1603, and discovered the exact date of birth of Tsar Boris Godunov: August 2 (Julian calendar) or August 12 (Gregorian calendar). The scholars then verified and confirmed this date with other 17th-century sources—in particular, with the notes of Baron Heinrich von Logau, the Empire's ambassador in Moscow. The results of the study are presented in a paper published in the Studi Slavistici journal (Florence, Italy), and in a follow-up paper to be published by the same journal at the end of the year.