These notes come together to explore the literary heritage of Pavel Muratov (1881-1950). The first one argues against Daniela Rizzi to reveal the historic source of “The Tyrannicides” (1923), a short story, in the circumstances of the murder of Galeazzo Maria Sforza in 1476. The second shows the irony of the final draft of “The Ambassador” (1928), likewise a short story, to spring from the waves Jean Cocteau made in the literary circles by the publication of his “Lettre b Jacques Maritain”. The third sheds new light on the attack of the young Lev Kassil on Muratov on the pages of “Za Rubezhom” (1931). As it was, Kassil, a mere hack, wrote on Gorky's spur, never bothering to even get to know who Muratov was.