The Trivium (which did not include history, something regarded as inferior by (eg) Aristotle), was designed to produce advocates in the law courts of Rome. The Quadrivium I'm less sure about: it may have been added as a step on the way to real learning, namely the degree in theology. None of this had anything to do with "landed scions" for whom the relevant training was in jousting, dancing, hawking, hunting, heraldry, and other courtly activities. The claim that the landed aristocracy needed university learning was put forward in the Renaissance by self-interested humanists (see J. H. Hexter's article "The Education of the Aristocracy in the Renaissance". Remember that scholars were not usually gentlemen!