Prince Mikhail Mikhailovich Ustinov (1800, 1871) was a diplomat, a member of the Ministry of Foreign Affairs council, and a secret advisor. He held the rank of major general and was considered the richest landowner in the Petrovsky district of Saratov province. He was born in the village of Gryaznukha, now Sosnovoborskoye, in the Petrovsky district of Saratov region, to the wine tax collector Mikhail Adrianovich, who received hereditary nobility, and his wife Marfa Andreyevna Veshnyakova. He received his education at Moscow University, graduating in 1818, although he was formally listed in service since 1803, when at the age of three he was enrolled in the treasury office.

In 1806, he became a senate registrar, in 1812, a collegiate secretary, and in 1815, a titular advisor. In 1819, he entered the Life Guards Cavalry, and in 1820, he was promoted to cornet. In 1823, due to illness, he retired, but in 1824, he returned to service in the Ministry of Foreign Affairs. In 1829, he was sent to Count Paskevich as a second diplomatic official, and in 1830, he became a second advisor in Constantinople. In 1832, he was appointed vice-director of the Asian department, but a year later, he was dismissed due to illness and went abroad for treatment, where he stayed until 1835. In 1839, he became an actual state councilor, and in 1843, a member of the Ministry of Foreign Affairs council.

From June 1846 to August 1847, he led the Russian mission in Constantinople. In 1850, he was appointed director of the economic department and promoted to secret advisor, managing the department until 1854.

Ustinov bequeathed 125,000 rubles and a plot of land in Saratov for the construction of a charitable institution. The Saratov provincial zemstvo, in agreement with his sons, fulfilled this bequest, and in 1879, a charitable institution bearing his name was opened in Saratov. Initially, it accommodated 20 men and 20 women, and from 1885, 50 people.

Ustinov owned about 20,000 desyatinas of land and approximately 1,000 serfs in the Petrovsky district, as well as sheep and horse breeding farms. In the Penza province, he had two distilleries and another horse breeding farm, and in the Simbirsk province, 840 desyatinas with 168 serfs.

He was married to the lady-in-waiting Sofia Alexandrovna Polyanskaya. They had two children: Mikhail (1841, 1878) and Alexander (1842, 1912). He is buried in the Alexander Nevsky Lavra.