The question to be raised with the opinion of Lord Mansfield, therefore, is not in respect to the incongruity of the two systems, but whether slavery was absolutely contrary to the law of England; for if it was so, clearly, the American laws could not operate there. Historical research ascertains that at the date of the Conquest the rural population of England were generally in a servile condition, and under various names, denoting slight variances in condition, they were sold with the land like cattle, and were a part of its living money. Traces of the existence of African slaves are to be found in the early chronicles. Parliament in the time of Richard II, and also of Henry VIII, refused to adopt a general law of emancipation. Acts of emancipation by the last-named monarch and by Elizabeth are preserved. The African slave trade had been carried on, under the unbounded protection of the Crown, for near two centuries, when the case of Somersett was heard, and no motion for its suppression had ever been submitted to Parliament; while it was forced upon and maintained in unwilling colonies by the Parliament and Crown of England at that moment. Fifteen thousand negro slaves were then living in that island, where they had been introduced under the counsel of the most illustrious jurists of the realm, and such slaves had been publicly sold for near a century in the markets of London. In the northern part of the kingdom of Great Britain there existed a class of from 30,000 to 40,000 persons, of whom the Parliament said, in 1775, (15 George III, chap. 28,) "many colliers, coal-heavers, and salters, are in a state of slavery or bondage, bound to the collieries and salt works, where they work for life, transferable with the collieries and salt works when their original masters have no use for them; and whereas the emancipating or setting free the colliers, coal-heavers, and salters, in Scotland, who are now in a state of servitude, gradually and upon reasonable conditions, would be the means of increasing the number of colliers, coal-heavers, and salters, to the great benefit of the public, without doing any injury to the present masters, and would remove the reproach of allowing such a state of servitude to exist in a free country," &c.; and again, in 1799, "they declare that many colliers and coal-heavers still continue in a state of bondage." No statute, from the Conquest till the 15 George III, had been passed upon the subject of personal slavery. These facts have led the most eminent civilian of England to question the accuracy of this judgment, and to insinuate that in this judgment the offence of _ampliare jurisdictionem_ by private authority was committed by the eminent magistrate who pronounced it.