Lazare Carnot
Algebraic solutions to Apollonius' problem were pioneered in the 17th century by René Descartes and Princess Elisabeth of Bohemia, although their solutions were rather complex. Practical algebraic methods were developed in the late 18th and 19th centuries by several mathematicians, including Leonhard Euler, Nicolas Fuss, Carl Friedrich Gauss, Lazare Carnot, and Augustin Louis Cauchy.