Uther’s love for Igrayne causes all kinds of trouble for his kingdom, since she’s the wife of his duke, Gorlois. This love-triangle hints at the many love triangles to come, like the Arthur-Gwenyvere-Launcelot fiasco, or the Mark-Igrayne-Trystram affair. It’s fitting, then, that Arthur is the product of one of these love triangles, because eventually a similar entanglement will be his undoing.