Pope Urban II proposed the crusades which lasted for approximately 200 years.
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Crusades
300
300 years
400 years
Vatican II lasted approximately 3 years: 1962-1965.
The First World War lasted for more than four years (28 July, 1914-11 November, 1918).
He was approximately 30 years old. His ministry lasted for about three years and within that time changed the world forever. He was approximately 33 years old when he was crucified. I believe this is fairly accurate.
The Mesozoic Era lasted approximately 250 million years ago to about 67 million years ago .
The Precambrian Super-Eon lasted from 4,576.2 until 542 million years ago approximately 4.0422 billion years.
The Scimitar dates back to the Ottoman Empire, which lasted approximately 623 years from 1299 to 1922.
The Archean Eon lasted from about 4 billion to 2.5 billion years ago, making it approximately 1.5 billion years in duration.
Romantic EraThe Romantic Era lasted from 1850 to 1920. so it lasted 70 years. It was marked by artistic freedom. creativity and experimentation.
The Late Heavy Bombardment lasted approximately .12 billion years, from 3.92 to 3.8 Ga.