Thpolos tombs date back to Postpalatial period (1380-1200 BC)
Sources:
Joseph W. Shaw, Maria C. Shaw eds., Kommos: An Excavation on the South Coast of Crete, Volume I, Part I: The Kommos Region and Houses of the Minoan Town. Part I: The Kommos Region, Ecology, and Minoan Industries, Princeton University Press 2014, p.3