Constantinople was the prior name of the city of Istanbul, I don't believe it had a 'definition' other than 'large city'.
Constantinople
George was dead hundreds of years before the Crusades so did not participate.
Your mother
Constantinople.
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The first crusades began when the Seljuk Turks Conquered Constantinople.
Geoffroi de Villehardouin has written: 'Memoirs or Chronicle of the Fourth Crusade and the Conquest of Constantinople' 'Memoirs or Chronicle of the Fourth Crusade and the Conquest of Constantinople' 'Memoirs of the Crusades' 'La Conquete de Constantinople' -- subject(s): Crusades, Siege, 1203-1204 'Memoirs of the Crusades [by] Villehardouin and De Joinville' -- subject(s): Crusades 'De la conqueste de Constantinoble' -- subject(s): Crusades, History 'La conquote de Constantinople' 'Histoire de la conqu^ete de Constantinople.' -- subject(s): Crusades, History
Pope Urban II called upon Christendom to go on the Crusades in 1095; Constantinople fell to the Ottoman Turks in 1453. You do the math. ^_^
Yes they did. They managed to conquer Constantinople in 1204 and formed The Latin Empire of Constantinople until 1261 when The Emperor of Nicea reconquered the City for The Byzantine Empire.
Not much random people from all over Europe joined the crusades but Venetians did sack Constantinople in the 4th crusade.