sentences:  In 1869, Ruskin became the first Slade Professor of Fine Art at the University of Oxford, where he established the Ruskin School of Drawing.In 1871, he began his monthly "letters to the workmen and labourers of Great Britain", published under the title "Fors Clavigera" (1871–1884).In the course of this complex and deeply personal work, he developed the principles underlying his ideal society.