The Shashtar, Sheshtar or Shashtay (probably from PersianŞaş-tar or Şeş-tar, ششتار or ششتار, lit.'six-string', 'having six strings') is a stringed musical instrument of the lute family. It was mentioned historically by Evliya Çelebi and Abd al-Qadir Maraghi.[1][2] It is or was played in Iran/Persia, Afghanistan, Azerbaijan and elsewhere.[3][4][5][6][7] It may have been developed during the Safavid dynasty from the tambur.[8][9] Like the tambur, it has a floating bridge and a wooden soundboard (not skin like the rubab etc). The 6 gut strings were in 3 double courses, and thus it may be a forerunner of the Tar.[10][11]
^Chabrier, Jean-Claude (2008). "ʿŪd". Encyclopedia of Islam: 534. "The ḳabūs (al-Ḥid̲j̲āz), ḳabbūṣ (ʿUmān), ḳanbūṣ (Ḥaḍramawt), ḳupūz or ḳūpūz (Turkey) is a very old instrument. Evliyā Čelebi [q.v.] says that the ḳūpūz was invented by a vizier of Meḥemmed II (d. 886/1481) named Aḥmed Pas̲h̲a Hersek Og̲h̲lu. He describes it as being a hollow instrument, smaller than the shashtār, and mounted with three strings (Travels, i/2, 235). On the other hand, Ibn G̲h̲aybī says that the ḳūpūz rūmī had five double strings. The instrument is no longer used by the Turks, although it has survived under the name of kobza, koboz, in Poland, Russia, and the Balkans, but here it is the lute proper and not a barbaṭ type"