François Hemony (c. 1609-1667) and his brother Pieter, Pierre, or Peter Hemony (1619-1680) were the greatest carillon bell founders in the history of the Low Countries. They developed the carillon, in collaboration with Jacob van Eyck, into a full-fledged musical instrument by casting the first tuned carillon in 1644. The brothers' skill was unequaled in their time; after their death, their guarded trade secrets were lost, and not until the 19th century were bells of comparable tuning quality cast. Even today, most Hemony bells sound pure and clear.