He called himself the King of Rhovanion, but was in fact only its mightiest prince.
He received Prince Valacar of Gondor when he was on a diplomatic mission in Rhovanion. Valacar loved the country of Vidugavia so much that he married his daughter Vidumavi.
His realm was located between the eastern edge of the Mirkwood and the river Celduin (in Westron, called the River Running).