In June 1848, Wallachia's liberal revolution toppled Bibescu and installed a Provisional Government. Two of Cantacuzino's three sons, Ion and Grigore, were enthusiastic participants in the events. The former served on the Regeration Club (which grouped the most committed radicals) and its Central Electoral Committee. In the early stages, both Constantin and his Mavros daughter-in-law helped the radical Nicolae Bălcescu evade police round-ups at Telega. On June 11, the day of revolutionary victory, he wrote to Bălcescu a congratulatory and "rather humble" letter. During the subsequent weeks, the new regime sought to obtain recognition from the Sublime Porte. The Cantacuzino home was also where the Provisional Government, represented by Ioan Voinescu II, welcomed Suleiman Pasha in August.