Grigory Aleksandrovich Chertkov in 1867, being in Florence, acquired copies from genuine Italian documents of the 17th century. These are the documents of the embassy of Likhachev and Fomin and the previous embassy of Chemodanov and Posnikov and others. Copies of the documents were issued to Chertkov from the central Florentine State Archive, signed and sealed by the director of the archive.