Gusli

It's a favorite instruments of Russian ancient bards and talers.

Some information from Wikipedia:

Gusli is the oldest Russian multi-string plucked instrument. Its exact history is unknown, but it may have derived from a Byzantine form of the Greek kythare, which in turn derived from the ancient lyre. It has its relatives throughout the world - kantele in Finland, kannel in Estonia, kankles and kokle in Lithuania and Latvia. Furthermore, we can find kanun in Arabic countries and the autoharp in the USA. It is also related to such ancient instruments as Chinese gu zheng which has a thousand year history and its Japanese relative koto.

In the times of Kievan Rus’, the term gusli is thought to simply refer to any generic stringed instrument. The root of the term comes from the word to make sound in the wind. The term was eventually associated with the trapezoidal gusli-psaltyry (which may have originated in Byzantium).

Folk Gusli have from eleven to thirty-six gut or metal strings, tuned diatonically. There were two main forms: helmet-shaped and wing-shaped.

Helmet-shaped gusli is a variety of gusli held by the musician on his knees, so that strings were horizontal, resonator body under them. He uses his left hand to mute unnecessary strings and thus forming chords, while passing all the strings with his right hand. The instrument was spread in southern and western regions of Kievan Rus’.

wing-shaped gusli is much smaller, and had more resemblance to Scandinavian folk psalteries such as the kantele. They were held much more like modern guitars (although strings were still muted by the left hand through a special opening in the instrument's body). This modification was more prevalent in northern parts of Russia, especially Novgorod and Pskov.

How it looks:

From mystery of music

Example of playing: