Sentence:  An important rule of heraldry (often overlooked by makers of historical dramas) is that only the <WSD>arms-bearer</WSD> could wear or use his own arms and fly his own banner and standard - his retainers and followers could only use his livery colours and his badge or badges on pennons and flags. 
Meaning of the word marked with <WSD> tags:  An armed fighter, such as a soldier or knight; one who carries and uses a weapon, as opposed to a member of the support personnel.