The oldest known English county teams are Kent, Surrey and Sussex, all of which have histories commencing in the early 18th century. These counties had achieved a high standard long before their modern county clubs were founded (from 1839 to 1845), and so they have always had first-class status. Following a meeting in May 1894 of Marylebone Cricket Club (MCC) and the County Championship clubs, the concept of "first-class cricket" was officially defined. By 1895, several other counties had also been recognized as having first-class status, as had MCC itself from its foundation in 1787. Top-class limited overs cricket began in 1963 when the County Championship clubs took part in the first seasonal knockout tournament, which was won by Sussex. Hence, like all the other first-class counties, Sussex for example is classified as a List A team from 1963; and as a top-class Twenty20 team since 2003.