The achievement of textile producers in Roman Britain is highlighted most strikingly by two sets of entries in the Edict of Diocletian, a conspectus of traded goods and services available across the Empire, published in A.D. 301. The British birrus, a hooded cape of wool, is ranked equal sixth in a list of fourteen categories of birrus distinguished from one another by price and quality. A corresponding, but shorter, list of tapetia, wool rugs, puts both the British first-class and second-class grades ahead of all the rest: the British tapete, in short, was second to none. No other British product was deemed worthy of mention by the compilers of the Edict; prima facie, therefore, one could argue that textile production was Britain's leading industry by the late third century A.D. Can such a notion be substantiated?