Konami has announced that Castlevania: Lords of Shadow is now backward compatible on Xbox One. While many people don’t look back on it too fondly, it and its direct sequel are the last official Castlevania games released by Konami. They act as prequels to the rest of the series, so you can safely jump in without any prior knowledge of the franchise and be okay.
Source: Destructoid Castlevania: Lords of Shadow and Ace Combat 6 are now backward compatible on Xbox One