- At the request of a number of great personages in Lorraine he composed in 860 his De divortio Lotharii et Teutbergae, in which he vigorously attacked, both from the moral and the legal standpoints, the condemnation pronounced against the queen by the synod of Aix-la-Chapelle (February 860).
- The disinterested peace of Aix-la-Chapelle (October 1748) had no effectual result other than that of destroying in Germany, and for the benefit of Prussia, a balance of power that had yet to be secured in Italy, despite the establishment of the Spanish prince Philip at Parma.
- Of the Quadruple Treaty signed at Paris on the 10th of November 1815 - which renewed that of Chaumont and was again renewed, in 1818, at Aix-la-Chapelle - the, scope of the Grand Alliance was extended to objects of common interest not specifically defined in the treaties.
- Senac witnessed the beginnings of the Revolution in Paris, but emigrated in 1790, making his way first to London, and then, in 1791, to Aix-la-Chapelle, where he met Pierre Alexandre de Tilly, who asserts in his Memoirs that Senac attributed the misfortunes of Louis XVI.
- The peace of Aix-la-Chapelle, in 1748, in which the influence of Great Britain was exerted on behalf of the States, though it nominally restored the old condition of things, left the Provinces crippled by debt, and fallen low from their old position among the nations.