Which city was famed for its crossbowmen mercenaries during the Middle Ages?

The Genoese crossbowmen were a famous military corps of the Middle Ages, which acted both as mercenaries for many European powers. Armed with crossbows made in Genoa by the Balistai Corporation, they fought both on land (including the Siege of Jerusalem and Battle of Crécy) and in naval battles. The Genoese crossbowmen remained one of the most respected military corps until the 16th century, well after the introduction of black-powder weapons in Europe.