En-Zu or Sin is the Lord of Wisdom He is commonly designated as En-zu, i.e. "lord of wisdom,". This attribute clings to him throughout all periods. During the period (c. 2600-2400 BC) that Ur exercised a large measure of supremacy over the Euphrates valley, Sin was naturally regarded as the head of the pantheon. It is to this period that we must trace such designations of the god as "father of the gods," "chief of the gods," "creator of all things," and the like. We are justified in supposing that the cult of the moon-god was brought into Babylonia by the Semitic nomads from Arabia. Cited from Website: Nationmaster