We celebrate the successful Greek War of Independence waged against the Ottoman Empire (the Turks) between 1821 and 1832. Byron became a national hero here fighting this good fight. Unfortunately he died from fever contracted in the swamps of Messalonghi in 1824, but he became a greek hero nevertheless. He has a suburb named after him in Athens.
25th March is also, naturally enough, a church festival. On 25th March, 9 months before Christmas, Archangel Gabriel told Mary that she would become the, virgin, mother of Jesus Christ, Son of God.