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 it's called the river Running).
wikipedia.org dumped 2003-03-17 with terodump