Calder v. Bull

After a probate court invalidated a will, vesting property in the Calders (plaintiffs), the Connecticut legislature passed a law setting aside that decision and ordering a new hearing, which resulted in the will being approved and the property passing instead to the Bulls (defendants). The Calders challenged the new law as an unconstitutional ex post facto law, but Connecticut's courts upheld it, and the Calders sought review from the U.S. Supreme Court.