Was Wolf the Quarrelsome, supposed brother of Brian Boru a real person? Did he really fight off Viking warriors who invaded Ireland?

by stevie_janowskii

Did he really exist, and what sources do we have proving his existence and his skill in battle?

Thanks.

Bayoris

Can you say where you heard about Wolf the Quarrelsome? (I read a history of Brian Boru this year and there was no mention of a brother named Wolf.)