The New International Encyclopædia…
“ In time Borsippa became a suburb of Babylon and the union between the two was symbolized by erecting a shrine to Nebo in Marduk's temple at Babylon to which Nebo was carried in solemn procession on the New Year's Day, while the statue of Marduk was on the return trip carried part way back to E-zida (‘the true house’) , Nebo's temple in Borsippa. To express further the relationship to Marduk, Nebo was regarded as the son of Marduk. Originally an agricultural deity, Nebo became in time the god of wisdom, and it is in this capacity that he was chiefly worshiped by the Assyrians. ”
