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He is Bergil's uncle from Lossarnach, presumably either Beregond's brother or his brother-in-law. He is only mentioned by Bergil and never appears in person, though he likely fights in the siege of the city and the battles of the Pelennor Fields and the Black Gate.
In Peter Jackson's 2003 film adaptation of The Return of the King, there is a similarly named character named Irolas (played by Ian Hughes). He is an officer of Minas Tirith who appears after Faramir retreats from Osgiliath.