See, e.g., L. Gautier, La Chevalerie, Ch. IX.
Howard, op. cit., vol. i, pp. 293 et seq.; Esmein, op. cit., vol. i, pp. 25 et seq.; Smith and Cheetham, Dictionary of Christian Antiquities art. "Contract of Marriage."
Any later changes in Catholic Canon law have merely been in the direction of making matrimony still narrower and still more remote from the practice of the world. By a papal decree of 1907, civil marriages and marriages in non-Catholic places of worship are declared to be not only sinful and unlawful (which they were before), but actually null and void.