The Greek War of Independence in 1821, also known as the Greek Revolution was the revolt of the Greeks against the Ottoman Empire, in order to throw off the ottoman rule. The revolution was organized by a secret organization, the Filiki Eteria, which was founded in 1814 in Odessa, Russia. The first battle of the war was declared in 1821 in the Danubian principalities. Philhellenism contributed to the support of France, Great Britain and Russia, to the Greeks in battle and to the creation of an autonomous independent state of Greece and the finalizization of the State's borders, in 1832.

The Themelis family offered important help to the Greeknation, both in the pre-revolutionary period, and during the War of Independence. In particular, Demetrios Themelis, who was an ardent apostle of the Filiki Eteria (Society of Friends) and the official attaché of Demetrios Ypsilantis, upon his arrival at Peloponnese in 1821, contributed greatly to the War of Independence, for the purposes of which, he offered his whole property.

The weapons of the Greek revolutionaries, such as the gats (koympoyria) and the sabers (swords), played an important role in the success of the revolution. The curved sabers were an important part of the weaponry of the fighters of 1821, which hung on the soldier's shoulder with silky cylindrical cordage or on their leather belt, which they wore in their midst body. The sword, which was used even in the era of the Turkish occupation, and during the Revolution, had a long blade, convex in its ridge and concave in the brink.

Weapons of the revolution of 1821, are exhibited at the National Historical Museum and at the Benaki Museum in Athens, at the War Museum in Nafplio and at the Hydra Museum - Historical archives, in Hydra.