Background: John Ruskin (8 February 1819 - 20 January 1900) was the leading English art critic of the Victorian era, as well as an art patron, draughtsman, watercolourist, a prominent social thinker and philanthropist. He wrote on subjects as varied as geology, architecture, myth, ornithology, literature, education, botany and political economy. His writing styles and literary forms were equally varied. He penned essays and treatises, poetry and lectures, travel guides and manuals, letters and even a fairy tale.
Context: Ruskin was unanimously appointed the first Slade Professor of Fine Art at Oxford University in August 1869, largely through the offices of his friend, Henry Acland. He delivered his inaugural lecture on his 51st birthday in 1870, at the Sheldonian Theatre to a larger-than-expected audience. It was here that he said, "The art of any country is the exponent of its social and political virtues.". Thus, its effect on each man should be visible and moving. Cecil Rhodes cherished a long-hand copy of the lecture, believing that it supported his own view of the British Empire. In 1871, John Ruskin founded his own art school at Oxford, The Ruskin School of Drawing and Fine Art. It was originally accommodated within the Ashmolean Museum but now occupies premises on "the High" (High Street). Ruskin endowed the drawing mastership with PS5000 of his own money. He also established a large collection of drawings, watercolours and other materials (over 800 frames) with which to illustrate his lectures. The School challenged the orthodox, mechanical methodology of the government schools (the "South Kensington System"). His lectures were often so popular that they had to be given twice--once for the students, and again for the public. Most of them were eventually published (see Bibliography). He lectured on a wide range of subjects at Oxford, his interpretation of "Art" encompassing almost every conceivable area of study, including wood and metal engraving (Ariadne Florentina), the relation of science to art (The Eagle's Nest) and sculpture (Aratra Pentelici). His lectures ranged through myth, ornithology, geology, nature-study and literature. "The teaching of Art...," Ruskin wrote, "is the teaching of all things." Ruskin was never careful about offending his employer. When he criticised Michelangelo in a lecture in June 1871 it was seen as an attack on the large collection of that artist's work in the Ashmolean Museum. Most controversial, from the point of view of the University authorities, spectators and the national press, was the digging scheme on Ferry Hinksey Road at North Hinksey, near Oxford, instigated by Ruskin in 1874, and continuing into 1875, which involved undergraduates in a road-mending scheme. Motivated in part by a desire to teach the virtues of wholesome manual labour, some of the diggers, which included Oscar Wilde, Alfred Milner and Ruskin's future secretary and biographer, W. G. Collingwood, were profoundly influenced by the experience--notably Arnold Toynbee, Leonard Montefiore and Alexander Robertson MacEwen. It helped to foster a public service ethic that was later given expression in the university settlements, and was keenly celebrated by the founders of Ruskin Hall, Oxford. In 1879, Ruskin resigned from Oxford, but resumed his Professorship in 1883, resigning again in 1884. He gave his reason as opposition to vivisection, but he had increasingly been in conflict with the University authorities, who refused to expand his Drawing School. He was also suffering increasingly poor health. CANNOTANSWER
Question: When was he appointed?

Answer:

August 1869,