Greece declared its independence from the Ottoman Empire on March 25, 1821.
This day is one of the most important events in the history of Greece, that is why it started celebration of Independence Day.
Greece chose another date for the holiday celebrating Independence Day than the actual day of gaining independence.
The declaration of independence from the Ottoman Empire started the Greek War of Independence, also known as the Greek Revolution.
The war lasted for more than 11 years and it involved Russia, the United Kingdom, France, Egypt and Tunis.
The revolt started in the southern Peloponnese and during the next three months it spread to Cyprus, Crete, a part of continental Greece and islands in the Aegean Sea.
The revolutionist were able to capture a significant part of the territory, but the Ottoman Empire used repressions to suppress the revolt.
The Greek War of Independence ended in 1829, its results were set in the London Protocol of August 30, 1832.
It set the boundaries of the new Greek Kingdom.
The exact date, when Greece gained independence, is hard to determine.
The First Hellenic Republic was created on January 1, 1822 and its independence was canceled in June of 1829.
London Protocol was signed on 3 February, 1830, but it was accepted by Greece only two years later.