The 1821 Revolution refers to the Greek War of Independence, which began in 1821 and aimed to free Greece from over 400 years of Ottoman rule. The revolution was fueled by a desire for national identity and independence, inspired by the Enlightenment and other European revolutions. Key figures included Theodoros Kolokotronis and Georgios Karaiskakis, who played significant roles in leading the Greek forces. The conflict lasted until 1829, resulting in the establishment of an independent Greek state. The revolution garnered support from various European countries, leading to the intervention of powers like Britain, France, and Russia. The war is celebrated annually in Greece on March 25th, known as Independence Day.