The Pioneer Column, a military volunteer force of settlers organised by Cecil Rhodes, founded the city on 12 September 1890 as a fort. They originally named the city Fort Salisbury after The 3rd Marquess of Salisbury, then-Prime Minister of the United Kingdom, and it subsequently became known simply as Salisbury. The Salisbury Polo Club was formed in 1896. It was declared to be a municipality in 1897 and it became a city in 1935.