Jupiter was the King of the Gods and the Lord of Heaven. The Romans attributed to him power over all the changes in the heavens - rain, storms, thunder and lightning. Jupiter determined the course of all earthly and human affairs: he foresaw the future, and the events happening in it were the results of his will. He revealed the future to man through signs in the heavens and the flight of birds. Jupiter was the guardian of law and the protector of justice and virtue. He maintained the sanctity of an oath, and presided over all transactions which were based upon faithfulness and justice.