Excerpted from that web-site

The last famous Brennan highwayman and the one most commonly remembered today was Willie Brennan who operated in southern Tipperary and northern Cork during the second half of the eighteenth century. His main haunts were Kilworth in County Cork and its surrounding hills. To his credit "no blood sullied his exploits." While his reputation was that he robbed from the rich and gave to the poor and always helped a widow in distress, that he was a highwayman pure and simple is evident from the fact that it was said that the great Daniel O'Connell, the Liberator, while making a name for himself as a barrister on the Munster circuit, always carried loaded pistols to protect himself from Willie Brennan and other robbers." Brennan too met a violent end in 1804 when he was captured at Clonmore in northern Tipperary and hanged at Clonmel in the same county. His fame survives to this day for it is he who is the subject and hero of the recitation Brennan Roe and the popular ballad Brennan on the Moor.