Furrer v Snelling (1220) 38 Michalmass 13 Jac B R Dyer, 55 is a very early contracts and property case, in English law. A tenant entered a Covenant for payment of rent of £20 per annum, for 4½ years. However, the case was bought for non-payment of £100 which the plaintiff claimed for the rent.
The judge found that "in covenant damages only are to be recovered and this surplus in miscomputing shall be abated", and "where more is demanded than is due... the debt only, is to be recovered".
References
Furrer v Snelling Wikipedia(Text) CC BY-SA