Ulubatlı Hasan, Hasan of Ulubat (1428 – May 29, 1453) was a Timarli Sipâhî in the service of Sultan Mehmed II of the Ottoman Empire who achieved legendary status as a heroic Turkish martyr at the successful Siege of Constantinople.
[1] He was born in a small village called Ulubat (near Karacabey) in the province of Bursa.
Ulubatlı Hasan was among the first to climb the walls of Constantinople followed closely by thirty of his friends.
[citation needed] He climbed the wall, under showers of arrows, stones, spears and bullets.
He reached the top and he placed the flag, which he defended until his 12 remaining friends arrived.