Sempronius Stretton, 1781-1842 by William Salter. In April 1801. Whilst he was in Canada he used his artistic skills to sketch not only landscapes but also made a valuable record of the wildlife and the local dress. Stretton's 1804 sketch of "York Barracks, Lake Ontario, Upper Canada, 1804" is credited as being one of the earliest pictures of what was to become the city of Toronto. Lieutenant Stretton served under Colonel Isaac Brock, who selected him to act as his aide-de-camp.