Bertrand Russell (1872–1970), born in Trelleck, Wales, was the grandson of the first Earl Russell, who introduced the Reform Bill of 1832 and served as prime minister under Queen Victoria. He studied mathematics and philosophy at Trinity College, Cambridge, 1890–1894, was a Fellow of Trinity College, 1895–1901, a Fellow of the Royal Society in 1908, and was a lecturer in philosophy, 1910–1916. Among his publications in philosophy in this period were An Essay on the Foundations of Geometry (1897), A Critical Exposition of the Philosophy of Leibniz (1900), The Principles of Mathematics (1903), Principia Mathematica (with A. N. Whitehead, 1910–1913), The Problems of Philosophy (1912) and Our Knowledge of the External World (1914).