Billy Smart Sr. bought the St.Leonard's Estate in the mid 1960s. After his death, the Royal Windsor Safari Park was founded in 1969 by his sons, the Smart brothers: Billy Smart, Jr., David Smart and Ronald Smart. Built on St Leonards Hill in Windsor in Berkshire, England, the 144 ac estate of rolling parkland and known as the St Leonards Estate included a 110-room country house owned by the American Horace Elgin Dodge Jr (son of Horace Elgin Dodge of Dodge Motor Cars) and occupied by the Kennedy Family during World War II, when JFK's father was US ambassador to the UK.