The chromatic Italian harps spread progressively throughout Europe: Haendel wrote his Concerto for a triple harp. However many other types of harps were still played. The majority of harps were probably still single-row harps; in Spain, chromatic harps were built with two crossing rows of strings; the Irish played, already for some centuries, a harp with metal strings...
In the 17th century a system of metal "forks" on the neck was developed in Germany. These forks could be turned one by one by hand to raise individual strings a semitone higher. In the 18th century these forks were linked to pedals with metal rods; the first pedal harps were born, ancestors of the modern orchestra harp.