A Royal House on ROBLOX is any form of Government in a clan, whether a Military or a roleplay Country. Royal Houses consist of the Leader of that group and the most trusted officials, typically. It is also referred too as the HCOM, the High Ranks, the High Command, or the HR's., although many in the Country Roleplay area of ROBLOX refer to it as simply the government, the Royals, or by the type of govt. it is (ex: the military, the democracy, etc.).
Royal Houses, when being directly referred too, are called the HR's or by what ever the most powerful position in the group is (ex: Commander, Emperor, King, etc.)