[IDEM libro tertio ad Plautium. ] §2.14.24.prSed si fideiussor in rem suam spopondit, hoc casu fideiussor pro reo accipiendus est et pactum cum eo factum cum reo factum esse uidetur.
[THE SAME, On Plautius, book 3] But if a surety has made a promise in his own interest, in this case the surety is to be treated as the principal debtor, and an agreement made with him is deemed to have been made with the principal debtor.