Why did the renaissance start in florence

It was in a handful of Northern Italian city states that the renaissance emerged. It would eventually spread to northern Europe but it was in Italy that the rebirth truly began. Independent city states such as Florence, Venice, and Rome grew wealthy through trade and banking creating a class of affluent businessmen.

the language dates from the contacts of arabian traders with the inhabitants of the east coast of africa over many centuries. under arab influence, swahili originated as a lingua franca used by several closely related bantu-speaking tribal groups.

do you have a list of sources to choose from?