sentences:  The Hittites had carried off the idol of the god Marduk, but the Kassite rulers regained possession, returned Marduk to Babylon, and made him the equal of the Kassite Shuqamuna.The circumstances of their rise to power are unknown, due to a lack of documentation from this so-called "Dark Age" period of widespread dislocation.No inscription or document in the Kassite language has been preserved, an absence that cannot be purely accidental, suggesting a severe regression of literacy in official circles.