Since, according to Snorri, Ullr is Sif’s son and Thor’s stepson, Sif must have had at least one lover prior to the god with the big hammer. The passage from Lokasenna is especially interesting seen in this context. If Sif slept with Loki before she married Thor, then she would indeed be blameless of infidelity. And if Sif were once Thor’s lover, it might give him some motivation (jealousy, spite) for cutting off her beautiful hair when she married his rival. But if Sif and Loki were once lovers, does that suggest that Loki is Ullr’s father? Another candidate for a previous lover of Sif’s is Hrungnir. Perhaps that’s why he tries to steal her away from Thor later and why Thor and Hrungnir end up in a fatal duel. Hrungnir engages Thor in single combat. Snorri says that Ullr is especially good at single combat. Family resemblance? • Skaði Are Ullr and Skaði brother and sister? The idea that Ullr and Skaði are siblings has no basis in ancient lore, but is nevertheless a popular hypothesis