Jeanne de Divion was full of vague tales of the valuable papers belonging to the county of Artois which she had seen in the possession of Thierry, and the two women soon saw that some capital could be made for the claims of Robert d'Artois. Robert himself seems to have been reluctant, at first, to have any dealings with the degraded paramour of Thierry d'Hirecon; in place of vague asseverations of what she had seen among the papers of Thierry he demanded the documents themselves, if there were any. It is probable that at the time there were no documents; but Jeanne de Divion was resourceful and not too nice in regard to matters of conscience. Going to Arras to search among the papers of Thierry, she returned with an alleged treaty negotiated in 1281 between the paternal and maternal grand-fathers of Robert, under the terms of which the customs of Artois were set aside and the succession guaranteed to Philippe d'Artois's children, of whom Robert was the representative. Robert's scruples were laid at rest when this very questionable document, of which nobody had ever heard a word, was put into his hands. He wrote to his brother-in-law, now King of France, to demand a new investigation of the claims to Artois. Meanwhile, the Countess Mahaut set about collecting testimony in rebuttal, aiming especially to show the falsity of the alleged document containing the treaty. She arrested two servants of Jeanne de Divion, who testified, in the presence of several witnesses and of a notary who took down the depositions, that the treaty in question had been written by one Jacques Rondelet, clerk of Arras, at the dictation of Jeanne de Divion, on her recent visit to Arras. Moreover, the countess had the wisdom to get these witnesses to testify that they had not been coerced by her but testified of their own free will and accord. Then she interrogated Jacques Rondelet, who confirmed all that the servants had said, adding that he had written at dictation, and under oath of secrecy, from a document which Jeanne de Divion would not let him see.