The worship of Ramman in later times came very much into prominence. It was only in the days of Khammurabi that he came into his kingdom, as it were, and even then his worship was not very firmly established in Babylonia. With the rise of the Kassite dynasty, however, we find him coming more into favour, and his name bestowed upon Babylonian kings. He seems to have formed a triad with Sin and Shamash, and in the Hymn of Khammurabi we find him appealed to along with Shamash as 'Divine Lords of Justice.' Nebuchadrezzar I appears to have held him in high esteem, although he was unfriendly to the dynasty which first brought him into prominence, and this monarch couples him with Ishtar as the divinity who has chiefly assisted him in all his great undertakings. Indeed, Nebuchadrezzar evinced much partiality for Ramman, perhaps feeling that he must placate the especial god of those he had cast from power. He speaks of him as the 'lord of the waters beneath the earth,' and of the rains from heaven.
The place of Ramman's origin seems obscure. We have already dealt with his manifestations in more primitive days, but opinions appear to differ regarding the original seat of his worship, some authorities holding that it was Muru in Southern Babylonia, others that it is necessary to turn to Assyria for traces of his first worship. His cult is found in Damascus and extended as far south as the Plain of Jezreel. As Milton says:
"... Rimmon, whose delightful seat Was fair Damascus, on the fertile banks Of Abbana and Pharphar, lucid streams. He also 'gainst the house of God was bold A leper once he lost, and gained a king, Ahaz his sottish conqu'ror, whom he drew God's altar to disparage and displace For one of Syrian mode, whereon to burn His odious offerings, and adore the gods Whom he had vanquish'd."
This later theory would make him of Aramaic origin, but his cult appears to have been of very considerable antiquity in Assyria, and it might have been indigenous there. Moreover, the earliest mention of his worship is in the city of Asshur. As has been indicated, he was probably a storm-god or a thunder-and-lightning god, but he was also associated with the sun-god Shamash. But whatever he may have been in Babylonia, in Assyria he was certainly the thunder-deity first and foremost.