I Kings 9:23-28

Others were chiefs of the officials who were over Solomon’s work: five hundred and fifty, who ruled over the people who did the work. But Pharaoh’s daughter came up from the City of David to her house which Solomon had built for her. Then he built the Millo. Now three times a year Solomon offered burnt offerings and peace offerings on the altar which he had built for the LORD, and he burned incense with them on the altar that was before the LORD. So he finished the temple. King Solomon also built a fleet of ships at Ezion Geber, which is near Elath on the shore of the Red Sea, in the land of Edom. Then Hiram sent his servants with the fleet, seamen who knew the sea, to work with the servants of Solomon. And they went to Ophir, and acquired four hundred and twenty talents of gold from there, and brought it to King Solomon.