It used to be thought that the introduction of metal working into Britain was the result of an invasion of alien peoples, who partly exterminated and partly enslaved the long-headed Neolithic inhabitants. This view was based on the evidence afforded by a new type of grave known as the "Round Barrow". In graves of this class have been found Bronze Age relics, a distinctive kind of pottery, and skulls of broad-heads. The invasion of broad-heads undoubtedly took place, and their burial customs suggest that their religious beliefs were not identical with those of the long-heads. But it remains to be proved that they were the actual introducers of the bronze industry. They do not appear to have reached Ireland, where bronze relics are associated with a long-headed people of comparatively low stature.
The early Irish bronze forms were obviously obtained from Spain, while early English bronze forms resemble those of France and Italy. Cutting implements were the first to be introduced. This fact does not suggest that a conquest took place. The implements may have been obtained by traders. Britain apparently had in those ancient times its trading colonies, and was visited by active and enterprising seafarers.
[Illustration: Long-head (Dolichocephalic) Skull]
[Illustration: Broad-head (Brachycephalic) Skull Both these specimens were found in "Round" Barrows in the East Riding of Yorkshire]
The discovery of metals in Britain and Ireland was, no doubt, first made by prospectors who had obtained experience in working them elsewhere. They may have simply come to exploit the country. How these men conducted their investigations is indicated by the report found in a British Museum manuscript, dating from about 1603, in which the prospector gives his reason for believing that gold was to be found on Crawford Moor in Lanarkshire. He tells that he saw among the rocks what Scottish miners call "mothers" and English miners "leaders" or "metalline fumes". It was believed that the "fumes" arose from veins of metal and coloured the rocks as smoke passing upward through a tunnel blackens it, and leaves traces on the outside. He professed to be able to distinguish between the colours left by "fumes" of iron, lead, tin, copper, or silver. On Crawford Moor he found "sparr, keel, and brimstone" between rocks, and regarded this discovery as a sure indication that gold was _in situ_. The "mothers" or "leaders" were more pronounced than any he had ever seen in Cornwall, Somersetshire, about Keswick, or "any other mineral parts wheresoever I have travelled".[63] Gold was found in this area of Lanarkshire in considerable quantities, and was no doubt worked in ancient times. Of special interest in this connection is the fact that it was part of the territory occupied by Damnonians,[64] who appear to have been a metal-working people. Besides occupying the richest metal-yielding area in Scotland, the Damnonians were located in Devon and Cornwall, and in the east-midland and western parts of Ireland, in which gold, copper, and tin-stone were found as in south-western England. The Welsh _Dyfneint_ (Devon) is supposed by some to be connected with a form of this tribal name. Another form in a Yarrow inscription is Dumnogeni. In Ireland Inber Domnann is the old name of Malahide Bay north of Dublin. Domnu, the genitive of which is Domnann, was the name of an ancient goddess. In the Irish manuscripts these people are referred to as Fir-domnann,[65] and associated with the Fir-bolg (the men with sacks). A sack-carrying people are represented in Spanish rock paintings that date from the Azilian till early "Bronze Age" times. In an Irish manuscript which praises the fair and tall people, the Fir-bolg and Fir-domnann are included among the black-eyed and black-haired people, the descendants of slaves and churls, and "the promoters of discord among the people".