George Gabriel Stokes (1819-1903) was a British physicist and mathematician famous for a basic theorem of vector analysis. He worked on fluorescence and studied ultraviolet light. Stokes was the first to suggest the reason for the Fraunhofer lines but later disclaimed any prior discovery when Kirchhoff published the explanation. He was the first man since Newton to hold the three positions of Lucasian Professor at Cambridge, secretary, and then president of the Royal Society. Stokes, active in the Evangelical movement, was also president of the Victorian Society, founded to respond to Darwin's "Origin of Species". Stokes was knighted and created a baronet in 1889.