Nicolae Mavros (1786–1868), one of the educated high-ranking boyars in Wallachia, was General Inspector of the Danube quarantine (1832–1855) and President of the Archaeological Committee (1864–1868). This study is about Mavros’s lifestyle, family, land proprieties, and public carrier. Our research focuses mainly on the networks of family and friends in Wallachia, Moldavia, Russia, and Greece. We have found documents concerning Mavros in various funds held by National Historical Archives in Bucharest and Romanian Academy Library, such as the Metropolis of Ungro-Wallachia, the Chancellorship for Foreign Affairs in Wallachia, the Quarantine Committee and the Ministry of Cults and Public Instruction. We have also used information from the archives of his sons, Ion Cantacuzino and Ion Ghica.