He served 20 years (1862–1882) as the Governor General of Caucasia, being seated in Tbilisi, the town which most of his children remembered as the home of their childhood. In the Russo-Turkish War (1877-1878), he was nominal Commander-in-Chief of the Russian troops in the Caucasus and was appointed Field Marshal General in April 1878.
In the course of his life, four members of his family ruled as Emperors of Russia: his father, Nicholas I; his brother, Alexander II; his nephew, Alexander III; as well as his grand-nephew, Nicholas II, whose second daughter, Grand Duchess Tatiana, the Grand Duke was godfather to.
He was remembered by Grand Duchess Maria Pavlovna, granddaughter of his eldest brother, in her memoirs: "My great-uncle, Grand Duke Michael came from time to time to pay us visits. He was an old gentleman of great height and unforgettable elegance; he fascinated us by the perfection and harmony of his gestures, by his affability and his air of a grand seigneur of an epoch already vanished. He was the last of the Grand Dukes who, according to the custom of my grandfather's time, tutoi-ed the men, and in spite of his age he bowed with touching grace before the women as he kissed their hands."[3]
^Liste der Ritter des Königlich Preußischen Hohen Ordens vom Schwarzen Adler (1851), "Von Seiner Majestät dem Könige Friedrich Wilhelm IV. ernannte Ritter" p. 20
^Hof- und Staats-Handbuch des Großherzogtum Hessen (1879), "Großherzogliche Orden und Ehrenzeichen" p. 10
^Staatshandbuch für das Großherzogtum Sachsen / Sachsen-Weimar-Eisenach (1855), "Großherzogliche Hausorden" p. 11Archived 2019-12-05 at the Wayback Machine
^Hof- und Staats-Handbuch des Großherzogtum Baden (1868), "Großherzogliche Orden" pp. 50, 54, 60
^Hof- und Staats-Handbuch des Königreich Bayern (1908), "Königliche Orden" p. 8
^M. Wattel, B. Wattel. (2009). Les Grand'Croix de la Légion d'honneur de 1805 à nos jours. Titulaires français et étrangers. Paris: Archives & Culture. p. 516. ISBN978-2-35077-135-9.
^Bille-Hansen, A. C.; Holck, Harald, eds. (1900) [1st pub.:1801]. Statshaandbog for Kongeriget Danmark for Aaret 1900 [State Manual of the Kingdom of Denmark for the Year 1900] (PDF). Kongelig Dansk Hof- og Statskalender (in Danish). Copenhagen: J.H. Schultz A.-S. Universitetsbogtrykkeri. pp. 3–4. Retrieved 30 April 2020 – via da:DIS Danmark.
^Sveriges statskalender (in Swedish). 1905. p. 440. Retrieved 2018-01-06 – via runeberg.org.