The term 'Royal Order' refers to a set of rules or regulations that have been issued by a monarch or other ruling authority. The crossword solutions for this term are 'FIAT' (4 letters), 'EDICT' (5 letters), and 'DECREE' (6 letters). FIAT is a Latin word meaning 'let it be done' and is used to refer to an authoritative command or order issued by a monarch or other ruling authority. An EDICT is a formal proclamation or command issued by a monarch or other ruling authority, usually with the force of law. A DECREE is a formal order issued by a monarch or other ruling authority, usually with the force of law. All three terms refer to a set of rules or regulations issued by a monarch or other ruling authority.