Greek War of Independence: the island of Psara joins the Greek struggle for independence.

The Greek War of Independence, also known as the Greek Revolution or the Greek Revolution of 1821, was a successful war of independence by Greek revolutionaries against the Ottoman Empire between 1821 and 1829. In 1826, the Greeks were assisted by the British Empire, Kingdom of France, and the Russian Empire, while the Ottomans were aided by their vassals, especially by the Eyalet of Egypt. The war led to the formation of modern Greece, which would be expanded to its modern size in later years. The revolution is celebrated by Greeks around the world as independence day on 25 March.

Psara is a Greek island in the Aegean Sea. Together with the small island of Antipsara it forms the municipality of Psara. It is part of the Chios regional unit, which is part of the North Aegean region. The only town of the island and seat of the municipality is also called Psara.

April 10 is the 100th day of the year in the Gregorian calendar; 265 days remain until the end of the year.