Urd or Urth is the name of one of the three Norns, the Norse version of the Fates. She represents the past. Thus, in Ah! Megamisama/Oh! My Goddess Urd is the eldest of the goddess sisters. (If not the most mature...)

In the OVA/Manga series "Aa Megamisama", Urd is the older sister of Belldandy, and the goddess of Past.She first appears via a porn tape sent to Keiichi (which was nearly immediately played), in a Video Girl Ai-style entrance. Note that there are small differences beetween Manga and OVA story for the Urd's entrance.