1 Kings 10:15
Beside that he had of the merchantmen, and of the traffick of the spice merchants, and of all the kings of Arabia, and of the governors of the country. Beside that he had of the merchantmen, and of the traffick of the spice merchants, and of all the kings of Arabia, and of the governors of the country.
The gold counted as yearly revenue was not the whole of Solomon's wealth, for separate income came from merchantmen and from the traffic of spice merchants and traders. Further revenue was brought as tribute by all the kings of Arabia and by the governors of the country. This additional income beyond the reckoned gold helped bear the great expense of supporting his court.