Albert Barnes Commentary 1 Kings 5:1

"And Hiram king of Tyre sent his servants unto Solomon; for he had heard that they had anointed him king in the room of his father: for Hiram was ever a lover of David." — 1 Kings 5:1 (ASV)

Hiram, king of Tyre - Menander of Ephesus, who wrote a history of Tyre in Greek based on native Tyrian documents around 300 B.C., mentioned this Hiram as the son of Abibaal, king of Tyre. He said that Hiram ascended the throne when he was nineteen, reigned for thirty-four years, and, dying at the age of fifty-three, was succeeded by his son Baleazar. Menander spoke at some length about the dealings of Hiram with Solomon.

Sent his servants - This appears to have been an embassy of congratulation.