What is technically called the 'fungibility' of money, is its chief value as an article of commerce; and this fact could not long remain recognized, even by such a conservative class as legal officials.
But the fact that the word chattel has survived as the inclusive legal term for all movable goods, points, not merely to the great importance of cattle in primitive times, but to the importance of the notion of sale or barter in generating the institution of property.
Whatever else the Norman Conquest may or may not have done, it made the old haphazard state of legal affairs forever impossible.
It was not long before English Law took the one step needed to produce the modern scheme of legal remedies. And when it did, it used the Writ of Trespass as the starting point.