From The Modern Encyclopedia, published in the early 1930s:
Thomas Arnold (1795 – 1842). British schoolmaster. He was educated at Winchester and Oxford. In 1828 he was chosen headmaster of Rugby School, and there he did a great work in reforming the school and making the public school system respected and popular. Chosen professor of modern history at Oxford in 1841, he held this office with his headmastership until his death, June 12, 1842.