Sentence:  In answering this dilemma, Bado assesses the colours of fourteenth-century heraldry according to their status as primary, <WSD>mediary</WSD> or sub-mediary; their relative honour determined by the amount of elemental mixing gone into their creation. Thus Bado's opines that white is the highest colour in terms of honour, closely followed by black -- as opposed to Bartolo's contention that black was the lowest colour. (Red and blue are superior to green (as sub-mediary) in all fourteenth-century accounts of armorial colour I have seen) 
Meaning of the word marked with <WSD> tags:  (of color) Having a primary hue (red, blue, or gold), as opposed to one that can be created by mixing colors with primary hues.