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Shattuara became a vassal of the Assyrian king Adad-nirari I (1295-1263 BC) after the latter defeated him. In an inscription made by Adad-nirari I, he is said to have rebelled against his lord, but was captured and his oath of loyalty was renewed.
A later king also called Shattuara is suggested to have ruled Hanigalbat during the reign of the Assyrian king Shalmaneser I (1263-1233 BC). In an Assyrian inscription, King Shattuara of Hanigalbat is said to have waged war against Shalmaneser I. However, it seems more likely this event is a recapitulation of the revolt against Adad-nirari I, either by Shattuara or his son Wasashatta.