Archæologia Britannica (from Latin: Antiquities of Britain), the first volume of which was published in 1707, is a pioneering study of the Celtic languages written by Edward Lhuyd. Following an extensive tour of Great Britain and Ireland lasting more than four years, Lhuyd began work on Glossography, the first volume of a planned four-volume set, Archæologia Britannica, which combined innovative methods of historical linguistics, language comparison, and field research, to establish a genetic relationship between the Welsh, Cornish, Breton, Irish, Scottish Gaelic, and Gaulish languages. After a significant delay, the Glossography was finally published in 1707.