The 'Queensberry rules', the code of general rules in boxing, was named after John Douglas, 9th Marquess of Queensberry in 1867, and formed the basis of modern boxing. Snooker is another of the UK's popular sporting exports, with the world championships held annually in Sheffield. In Northern Ireland, Gaelic football and hurling are popular team sports, both in terms of participation and spectating. Irish expatriates in the UK and the US also play them. Shinty (or ''camanachd'') is popular in the Scottish Highlands. Highland games are held in spring and summer in Scotland, celebrating Scottish and celtic culture and heritage, especially that of the Scottish Highlands.