 In 1764 (Eriksen 1974) he presented his uncompromisingly neoclassical plans for the Church of St. Philippe-du-Roule ("illustration"; constructed 1774–1784); its colossal Ionic order of columns, which separated the barrel-vaulted nave from the lower, barrel-vaulted aisles, was carried around the apse without a break.In this church, which was built 1772-84, he revived a basilica plan that had not been characteristic of French ecclesiastical architecture since the sixteenth century.In 1775 he was appointed First Architect to the comte de Provence, brother of Louis XVI; he designed the pavilion of the comtesse de Provence at Versailles.