IOTL, William II of Holland was chosen as King of the Romans as an anti-king in 1248 and ruled as the sole King from 1254 to his death at the hands of Frisians in 1256. What if William hadn’t died and managed to become Holy Roman Emperor in his own right and pass the title on to his son Floris? Would the House of Holland be able to maintain control over the Holy Roman Empire? What impact does that have on the Low Countries? Even just as King of the Romans, William used his power to expand his personal control to Zeeland. Might we see the House of Holland continue to expand their personal power in the Low Countries?