Among the individuals who had followed the Queen-mother into exile was a certain Abbe Rucellai, a Florentine, who having failed to obtain advancement at the Court of Rome, had passed over to France in the hope of furthering his fortunes in that kingdom.  His anticipations appeared for a time likely to be realized, as he was warmly welcomed on his arrival by his countryman Concini; but the assassination of the favourite having blighted all his prospects, he resolved upon revenge, and as a first step offered his services to Marie de Medicis, by whom they were accepted.  The Queen-mother had no sooner formed her little Court than the Abbe proceeded to lay the foundations of his plot, which was based upon her return to power, and which he was well aware must involve the ruin of De Luynes; while at the same time he felt satisfied that he should be amply recompensed by Marie herself for his services.[4] No opposition had been made to the self-banishment of Rucellai by the Court party, as he was well known to be in infirm health and of effeminate habits; and to exhibit in every phase of his character the very reverse of a conspirator.  He had, moreover, made friends during his residence in Paris; and, through the interest of Zamet, had obtained the Abbey of Signy in Champagne, which, together with his family inheritance, secured to him an annual income of twenty thousand crowns.  This revenue he spent in the most liberal manner, and soon became very popular from the suavity and refinement of his manners, and his extreme generosity.  An affair of gallantry had, however, involved him in a quarrel with the nephew of the Duc d’Epernon; who, espousing the cause of his relative, in his turn excited the hatred of the Abbe.[5]

Rucellai had been but a short time at Blois before he felt that he could carry out his plans with greater facility in the capital than while subjected to the constant surveillance of the Court spies by whom Marie de Medicis was surrounded; and he accordingly obtained permission to return to Court, De Luynes being easily induced to believe that his application was caused by his weariness of the monotony of Blois, and his desire to participate once more in the gaieties of Paris.  The fact, however, was far otherwise.  The thirst for vengeance had produced a singular effect upon the Florentine; and although he still affected to enact the sybarite, in order to mislead those whom he sought to ruin, he became suddenly endued with a moral energy as well as a physical strength of which no one had believed him to be possessed.  Neither fatigue, danger, nor difficulty sufficed to paralyze his exertions; and if he was one hour at the feet of a Court beauty, he was busied the next in the most subtle and well-devised attempts to win over one or other of the great nobles to the cause of the exiled Queen.[6]