Law develops as society evolves. Historically, the simplest societies were tribal. The members of the tribe were bonded together initially by kinship and worship of the same gods. Even in the absence of courts and legislature there was law—a blend of custom, morality, religion, and magic. The visible authority was the ruler, or chief; the ultimate authorities were believed to be the gods whose will was revealed in the forces of nature and in the revelations of the tribal head or the priests. Wrongs against the tribe, such as sacrilege or breach of tribal custom, were met with group sanctions including ridicule and hostility, and, the tribe members thought, with the wrath of the gods. The gods were appeased in ritualistic ceremonies ending perhaps in sacrifice or expulsion of the wrongdoer. Wrongs against individuals, such as murder, theft, adultery, or failure to repay a debt, were avenged by the family of the victim, often in actions against the family of the wrongdoer. Revenge of this kind was based on tribal custom, a major component of early law.