Siege of Candia
1648 CE.
Shown on the map at 35.333°, 25.133°.
In the siege of Candia (now Heraklion, Crete), Ottoman forces besieged the Venetian-ruled capital city of the Kingdom of Candia. It lasted from 1648 to 1669 (a total of 21 years) and is one of the longest sieges in history. It ended with an Ottoman victory, but the effort and cost of the siege contributed to the decline of the Ottoman Empire, especially after the Great Turkish War.
Text from the Wikipedia article Siege of Candia, licensed CC BY-SA 4.0.