Otto Alexander Heinrich Dietrich Keyserlingk
- Born: 24 Dec 1765, Danzig
- Marriage: Emilie (Emilie) Alexandrine Von Doenhoff on 7 Jun 1791 in Königsberg, Ostpreussen
- Died: 4 May 1820, Danzig at age 54
 General Notes:
SPFX Graf
Otto married Emilie (Emilie) Alexandrine Von Doenhoff, daughter of August Christian (Christian) Ludwig Karl Von Doenhoff and Charlotte (Charlotte) Amalie Rollaz Du Rosey, on 7 Jun 1791 in Königsberg, Ostpreussen. (Emilie (Emilie) Alexandrine Von Doenhoff was born on 17 Jun 1769 in Friedrichstein and died on 18 Oct 1840 in Berlin.)
Marriage Notes:
Number of children:1
SURE 0
UTYP 1
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