Russian aristocrat (1887–1967) best known for participating in the strange and storied assassination of Grigori Rasputin. Two brief ALSs written and signed in Cyrillic. The first is signed “Felix,” one page, 8 x 5.25, stamp-dated February 20, 1956, in part (translated): “I am enclosing the monogram which you asked for. I am missing you, especially during difficult ‘days off’ in Germany.” A notation on the reverse reads (translated): “Accidentally saved among papers for destruction. Mother.” The second is also signed “Felix,” penned on both sides of a 6 x 3.5 card, no date, in part (translated): “I am strongly touched and very thankful for your check for Gregory. It miraculously saved him from inevitable (according the doctor’s opinion) death. Please call us some day and come to us. We didn’t see each other for quite some time.” In overall very good to fine condition, with various creases, notations, and show-through to the dated letter. RR Auction COA.