The harps that were most used in erudite music at the end of the Renaissance and in Baroque times were harps with several rows of strings. In Italy, the arpa doppia, with two parallel rows of strings, appeared in the 16th century. It is entirely chromatic but not without inconvenients, the biggest being that each hand is limited to a register: the diatonic scale (being the strings most used by the harpist) are on the side of the left hand in the bass and of the right hand in the treble.
Harp by Tim Hobrough