Lionel Kieseritzky, Estonian-French chess player (born 1806)

Lionel Adalbert Bagration Felix Kieseritzky was a Baltic German chess master and theoretician, known for his contributions to chess theory, as well for a game he lost against Adolf Anderssen, known as the "Immortal Game". Kieseritzky's name became associated with several openings and opening variations, such as the Kieseritzky Gambit, Kieseritzky Attack, and the Boden–Kieseritzky Gambit.