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Abbas Mirza (August 26, 1789 – October 25, 1833)[1] was a Qajar crown prince of Iran. He developed a reputation as a military commander during the Russo-Persian War of 1804–1813 and the Russo-Persian War of 1826–1828, as well as through the Ottoman–Persian War of 1821–1823. He helped modernize Persia's armed forces and institutions.

In October 1813, with Abbas Mirza as commander-in-chief, Persia was compelled to make a severely disadvantageous peace known as the Treaty of Gulistan, irrevocably ceding swaths of its territory in the Caucasus, comprising present-day Georgia, Dagestan, and most of Azerbaijan.

The drastic losses suffered by his forces made him realize that he needed to train Persia's military in the European style of war, and he started sending his students to Europe for military training. Influenced by Sultan Selim III's reforms, Abbas Mirza set out to create an Iranian version of the Ottoman Nizam-ı Cedid, and reduce the Qajar dependence on tribal and provincial forces. In 1811 and 1815, two groups were sent to Britain, and in 1812 a printing press was finished in Tabriz, as a means to reproduce European military handbooks, as well as a gunpowder factory and a munitions depot. The training continued with constant drilling by British advisers, with a focus on the infantry and artillery.

His newly reformed military was tested in the Ottoman–Persian War (1821–1823) began, and gained several victories resulting in a peace treaty signed in 1823 after the Battle of Erzurum.
In 1833, he sought to restore order in Khorasan province, which was nominally under Persian supremacy, and while engaged in the task died at Mashhad.