[ULPIANUS libro trigesimo sexto ad Sabinum. ] §23.3.29.prCum pater dotem pro filia promittit et dotem legat, si quidem marito legauit, uidendum est, an legatum ualeat, et non puto ualere: nam cum creditori debitor legat id quod debet, nullum legatum est.
[ULPIANUS in the thirty-sixth book on Sabinus.] When a father promises a dowry on behalf of his daughter and also bequeaths a dowry, if indeed he bequeathed it to the husband, it must be considered whether the legacy is valid, and I do not think it is valid: for when a debtor bequeaths to his creditor that which he owes, the legacy is void.
quod si filiae legauit, ualet legatum: dos enim ex promissione marito debetur, legatum filiae.
But if he bequeathed it to the daughter, the legacy is valid: for the dowry is owed to the husband by virtue of the promise, while the legacy is to the daughter.
et si quidem hoc animo testatorem esse filia ostenderit, ut duplicaret ei legatum, habebit utrumque, dotem quam maritus persecutus fuerit et legatum ex causa legati.
And indeed, if the daughter demonstrates that the testator had the intention to double the gift for her, she will have both: the dowry which the husband has sued for, and the legacy by title of legacy.
quod si alterutrum uoluit habere: si mulier legatum petat, opposita doli exceptione non alias cogetur ei heres legatum soluere, quam si cauerit indemnem hoc nomine heredem futurum aduersus maritum ex promissione agentem.
But if he wished her to have only one of the two: if the woman claims the legacy, upon the defense of fraud being interposed, the heir will not otherwise be compelled to pay her the legacy unless she gives security that the heir will be kept harmless on this account against the husband suing on the basis of the promise.
sed si maritus agat, nihil de indemnitate eum cauere oportebit, uerum mulier post eum agens exceptione repelletur, quia semel dos praestita est.
But if the husband sues, he will not be required to give any security for indemnity, but the woman suing after him will be repelled by a defense, because the dowry has already been provided once.