A somewhat mysterious place among the minor deities is held by two sisters named Thorgerd and Irpa, the former of whom also bears the epithet of _Hölgabrúðr_, apparently meaning 'Hölgi's bride.' All that is known of these is that they are alleged to have been worshipped by Earl Hákon of Norway, in the latter half of the tenth century. It is not improbable that their worship may have been confined to that part of Norway (in Thrandheim) in which Hákon lived, or that they were _dísir_ connected with the family to which he belonged. In the very legendary account of the battle which Hákon fought against the vikings of Jómsborg in 985, it is told that when he found the battle going against him 'he called upon his confidant Thorgerd, but she was angry with him and would not hear him.' It was only when propitiated by the sacrifice of Hákon's own son that she consented to aid him. She and her sister Irpa were then seen by second-sighted men fighting on the earl's side. The great reverence which the earl was believed to have felt for the sisters also appears strongly in the accounts relating to the images of them which he had in his temples; to that of Thorgerd he prostrated himself in prayer and made offerings of silver. Among the Scandinavians, as among other branches of the Aryan race, the practice of hero-worship appears to have been known. Adam of Bremen records it as occurring among the Swedes, who in the life of St. Ansgar are also said to have paid divine honours to one of their kings (Erik), assigning to him a temple and special priests. In Norway it is mentioned that offerings were made on the grave-mound of Olaf, at one time king in Vestfold; and probably some kind of religious feeling towards the deceased person is implied in the worship of grave-mounds, which was sufficiently prevalent to be specially forbidden in the early Christian law of Norway. One of the early settlers in the Færöes, Grím Kamban, is also said to have been worshipped after his death on account of his popularity. Not only human beings, but even animals, were perhaps occasionally worshipped by individuals. An old tradition related that a King Ögvald, in the west of Norway, chiefly worshipped a cow, and took it about with him wherever he went; and at a later and more historical date Hárek of Rein is said to have worshipped an ox. When Floki set out to look for Iceland he sacrificed to three ravens, which he then took on board with him that they might show him the way. It may also be noted that, if a very curious legend can be depended on, there were even traces of phallic worship in Norway as late as the days of Olaf the Saint (about 1020).