Lampleigh v Brathwait
Brathwait killed a man called Patrick Mahume unlawfully. He asked Lampleigh to ride to the King and petition for a pardon. Lampleigh was successful. Brathwait promised £100 to Lampleigh. But he never paid up. Lampleigh sued. Brathwait said that because the service had been performed in the past, there was no good consideration at the time for the promise, regardless of the fact that Lampleigh was successful in securing a pardon.
The Court of the King's Bench held that there was an implied understanding (i.e. implied assumpsit, or "assumption" of obligation) that a fee would be paid. Where a past benefit was conferred at the beneficiary's request, and where a reward would reasonably be expected, the promisor would be bound by his promise.