Original: The commune movement started in the 10th century , with a few earlier ones like Forlì ( possibly 889 ) , and gained strength in the 11th century in northern Italy which had the most urbanized population of Europe at the time .
Simplified: The commune movement started in the 11th century in northern Italy which had the most urbanized population of Europe at the time , and in what is now Belgium which was also relatively urban at the time .