Rubutu was a city, or city-state located in ancient northern Israel, between the city of Gazru-(modern Gezer), and Jerusalem during the time of the Amarna letters correspondence, a 15-20 year period at about 1350-1335 BC.
Some scholars place Rubutu near present-day Arrabah in the northern West Bank.
[1][2] The Amarna letters were mostly written to the pharaoh of Ancient Egypt, and three mayors of Gazru: Abimilku, Milkilu, and Yapahu authored 20 letters of the 382–letter, Amarna letters corpus.
They mention the war of various cities, the Habiru, and of: "the seizure of Rubutu".
Ta'anach Letter: by Guli-Adad, mentioning City-state-city: Rubutu