The case turned upon a question which was debated for centuries before it was settled, whether debt would lie for a sum of money promised by the defendant to the plaintiff if he would marry the defendant's daughter. But whereas formerly the debate had been whether the promise was not so far incident to the marriage that it belonged exclusively to the jurisdiction of the spiritual courts, it now touched the purely mundane doubt whether the defendant had had quid pro quo. It will be remembered that the fact formerly sworn to by the transaction witnesses was a benefit to the defendant, namely, a delivery of the things sold or the money lent to him. Such cases, also, offer the most obvious form of consideration. The natural question is, what the promisor was to have for his promise. /2/ It is only by analysis that the supposed policy of the law is seen to be equally satisfied by a detriment incurred by the promisee. It therefore not unnaturally happened that the judges, when they first laid down the law that there must be quid pro quo, were slow to recognize a detriment to the contractee as satisfying the requirement which had been laid down. In the case which I have mentioned some of the judges were inclined to hold that getting rid of his daughter was a sufficient benefit to the defendant to make him a debtor for the money which he promised; and there was even some hint of the opinion, that marrying the lady was a [269] consideration, because it was a detriment to the promisee. /1/ But the other opinion prevailed, at least for a time, because the defendant had had nothing from the plaintiff to raise a debt. /2/ So it was held that a service rendered to a third person upon the defendant's request and promise of a reward would not be enough, /3/ although not without strong opinions to the contrary, and for a time the precedents were settled. It became established law that an action of debt would only lie upon a consideration actually received by and enuring to the benefit of the debtor. It was, however, no peculiarity of either the action or contract of debt which led to this view, but the imperfectly developed theory of consideration prevailing between the reigns of Henry VI. and Elizabeth. The theory the same in assumpsit, /4/ and in equity. /5/ Wherever consideration was mentioned, it was always as quid pro quo, as what the contractor was to have for his contract.