One of the Hittite vassal kingdoms was almost certainly Troy (called “Ilios” and “Troia” by Homer and “Wilusa” by the Hittites). See the following articles in Archaeology Odyssey: “Greeks vs. Hittites: Why Troy is Troy and the Trojan War Is Real” (interview with Wolf-Dietrich Niemeier), July/August 2002; and “Is Homer Historical?” (interview with Gregory Nagy), May/June 2004.