The first correct accounts we have of Britain were given by Julius Cesar, who invaded and conquered the southern parts of the island, about fifty four years before the Christian era.[8] Tacitus, in his _Life of Julius Agricola_, has described the natives of the island, and given it as his opinion, that they came from Gaul (now France.) The inhabitants of Caledonia, now Scotland, in the color of their hair and size of their limbs, resembled the Germans. Some appearances in the people of the more southern parts of the island, and their position with respect to Spain, indicated _their_ descent from the ancient Iberi. But those who inhabited the shores, opposite to France, resembled the Gauls, in their religious ceremonies, their courage, and particularly in their language: "Sermo haud multum diversus."[10] It is an uncontroverted point, that the primitive language of Britain was the same as that of Gaul.[11] This language was denominated the Celtic, from the _Celtæ_, or _Keltæ_, a famous tribe of people that inhabited Gaul. Many writers suppose the Celtic to have been the primitive elementary language, from which most, or all the present languages of Europe, and some of the languages of Asia and Africa, are derived. Some authors go so far as to assert that the Greek and Roman may be traced to the same source. To prove this opinion well founded, they endeavor to discover an affinity between these languages, by analizing words in each, and tracing them to the same elements or monosyllabic roots. In this they have succeeded so far as to discover a great number of words, which, with small dialectical variations, are common to the Greek and Latin and to most of the living languages of Europe. Perhaps these radicals, common to all languages of which we have any knowlege, were sufficient to form a simple language, adequate to the purposes of speech among rude nations.[A]