The great festivals took place especially at three seasons in the year. One of these was at the close of autumn (about the middle of October) 'to greet the winter.' At mid-winter came the festival of Yule (_Jól_ or _Júl_), originally held in the middle of January, but afterwards altered to correspond with Christmas. The third was held at the end of the winter (about the middle of April) 'to greet the summer.' The precise time of each, however, may have varied in different parts of Scandinavia; Adam of Bremen, for instance, represents the great Upsala festival as taking place about the spring equinox, while Snorri places it a little earlier. As late as 1020 these three festivals were still kept up by the majority of the inhabitants in the district of Thrandheim in Norway, and must have been maintained in Sweden for nearly a century later. The return which the worshippers hoped to obtain from the gods for the sacrifices offered was mainly good seasons, abundant crops, peaceful times, and victory in war if it arose. To some extent each festival appears to have had a special object, but the statements on this point are not quite in agreement with each other. No doubt the desires of the worshippers were expressed in formal prayers offered up by the one who presided over the sacrifices, but no specimen of these has been preserved. Adam of Bremen asserts that in the sacrifices at Upsala use was made of many incantations of an odious character, but of the precise nature of these there is no indication. The drinking of the various toasts was certainly accompanied by formal speeches, of which those used in Iceland at a later date are probably the Christianised representatives. It is noteworthy that in most of the references to these great religious festivals there is no statement that the sacrifices were offered to any particular deity, the usual expression being simply 'to sacrifice for peace,' etc., or 'to the gods.' The same vagueness sometimes appears when more private offerings are mentioned; it is simply said that the person 'performed a great sacrifice.' It may naturally be assumed, however, that the deity appealed to would vary according to the boon desired, or the preferences of the worshipper. Adam of Bremen, in fact, states that in event of pestilence or famine the offering was made to Thor; in case of war it was given to Odin; while Frey was the recipient on the occasion of a wedding. The Swedes are also said to have sacrificed to Frey for peace and plenty, and Thorgrim in Iceland honoured the same god at the beginning of winter (p. 26). Earl Hákon's sacrifice to Odin has already been mentioned (p. 16), and is in agreement with Adam of Bremen's statement.