1 That those are no gods whom the common people worship, is known from this. They were formerly kings, who on account of their royal memory subsequently began to be adored by their people even in death. Thence temples were founded to them; thence images were sculptured to retain the countenances of the deceased by the likeness; and men sacrificed victims, and celebrated festal days, by way of giving them honour. Thence to posterity those rites became sacred which at first had been adopted as a consolation. And now let us see whether this truth is confirmed in individual instances.
Source: The Treatises of Cyprian (New Advent)