De Leon v. Manuel Trevino & Bro.
Texas Supreme Court · 1878-01-01 · cited 42×
The case concerned promissory notes given by Manuel Leon De Leon to Trevino & Bro. in settlement of a joint business venture during the Civil War that involved importing merchandise from Mexico into Texas and exporting cotton without complying with U.S. customs laws or regulations. The trial court excluded evidence that the underlying enterprise violated public policy and U.S. law, and the appellate court affirmed the judgment in favor of the plaintiffs on the notes. The court reasoned that although the original partnership may have been illegal, the notes arose from a voluntary post-completion accounting and settlement rather than from the illegal activity itself, creating a new enforceable contract not tainted by the prior illegality. It distinguished this from cases where notes were issued to further an illegal purpose, citing precedents that allow recovery on such settlement agreements.