Very little is known about this Rumiantsev, which suggests that he was not related to the noble branch who established the museum in their name. His primary focus was on various aspects of medieval Muscovy, including Rostov as well as Moscow; his most valued work in archeology seems to have been as the longtime secretary of the IMAO. He was one who considered archives central to the discipline, and he received the Uvarov Prize for work on the early Synodal typography.
Bartenev worked in the Moscow Archive of the Ministery of Foreign Affairs, and from 1863 he published the major journal “Russkii arkhiv.” He contributed to the Chertkov Library, the pfirst public one in Moscow, best known for its collection for Russian history. After 1905 he joined the monarchist political party, the Union of Russian People, best known for its anti-Semitic “Black Hundreds” groups.