His worship in the time of the early empire appears from the invocation of Tiglath-Pileser I., where he occurs in the third place, between Bel and Shamas.

[PLATE CXLII., Fig.
2.] His emblem, the crescent, was worn by Asshur-izir-pal, and is found wherever divine symbols are inscribed over their effigies by the Assyrian kings.

There is no sign which is more frequent on the cylinder-seals, whether Babylonian or Assyrian, and it would thus seem that Sin was among the most popular of Assyria's deities.

His name occurs sometimes, though not so frequently as some others, in the appellations of important personages, as _e, g._ in that of Sennacherib, which is explained to mean "Sin multiplies brethren." Sargon, who thus named one of his sons, appears to have been specially attached to the worship of Sin, to whom, in conjunction with Shamas, he built a temple at Khorsabad, and to whom he assigned the second place among the tutelary deities of his city.
The Assyrian monarchs appear to have had a curious belief in the special antiquity of the Moon-god.

When they wished to mark a very remote period, they used the expression "from the origin of the god Sin." This is perhaps a trace of the ancient connection of Assyria with Babylonia, where the earliest capital, Ur, was under the Moon-god's protection, and the most primeval temple was dedicated to his honor.
Only two temples are known to have been erected to Sin in Assyria.