Michael Andreas Barclay de Tolly, Russian field marshal and politician, Governor-General of Finland (b. 1761)
Prince Michael Andreas Barclay de Tolly (German: Fürst Michael Andreas Barclay de Tolly; 27 December [O.S. 16 December] 1761 – 26 May [O.S. 14 May] 1818) was an Imperial Russian soldier of Baltic German and Scottish origin, who was commander-in-chief and Minister of War of the Russian Empire during Napoleon's invasion in 1812 and the War of the Sixth Coalition. Barclay implemented a number of reforms during this time that improved supply system in the army, doubled the number of army troops, and implemented new combat training principles. He was also the Governor-General of Finland.

He was born into a German-speaking noble family from Livonia, who were of Scottish descent. His father was the first of his family to be accepted into the Russian nobility. Barclay joined the Imperial Russian Army at a young age in 1776. He served with distinction in the Russo-Turkish War (1787–92), the Russo-Swedish War (1788–90), and the Kościuszko Uprising (1794).

In 1806, Barclay began commanding in the Napoleonic Wars, distinguishing himself at the Battle of Pułtusk that same year. He was wounded at the Battle of Eylau in 1807 while his troops were covering the retreat of the Russian army. Because of his wounds, he was forced to leave command. The following year, he carried out successful operations in the Finnish War against Sweden. Barclay led a large number of Russian troops approximately 100 km across the frozen Gulf of Bothnia in winter during a snowstorm. For his accomplishments, Barclay de Tolly was appointed Governor-General of the Grand Duchy of Finland. From 20 January 1810 to September 1812 he was the Minister of War of the Russian Empire.

When the French invasion of Russia began in 1812, Barclay de Tolly was commander of the 1st Army of the West, the largest Army to face Napoleon. Barclay initiated a scorched earth policy from the beginning of the campaign, though this made him unpopular among Russians. After the Battle of Smolensk failed to halt the French and discontent among Russians continued to grow, Alexander I appointed Mikhail Kutuzov as Commander-in-Chief, though Barclay remained in charge of the 1st Army. However, Kutuzov continued the same scorched earth retreat up to Moscow where the Battle of Borodino took place nearby. Barclay commanded the right wing and center of the Russian army for the battle. After Napoleon's retreat, the eventual success of Barclay's tactics made him a hero among Russians. He became Commander-in-Chief in 1813 after the battle of Bautzen, replacing Wittgenstein (Who had been appointed after Kutuzov's death early in 1813) and led the taking of Paris, for which he was made a Field Marshal. His health later declined and he died on a visit to Germany in 1818.