The viola d'amore is a european instrument particularly popular from the 16th to 18th century. It's body is usually shaped like a viol though some examples of very elaborate festooned outlines. In construction they generally resemble violas da gamba often with an archtop and flat wanted back though some examples also have a carved back. Their most notable distinguishing feature is the extra set of sympathetic strings running under the fingerboard. There are a few other european instruments that