It only means "armoured royal contingent".
Personaly, I 've never come up against them but I assume that unless the A.I. includes several of those in the same army stack they will be dispatched with acceptable losses if ganged up and charged from behind after being tired by a good unit in "hold ground" defence mode.
Of course, if a human player uses them against the A.I. it is a whole different preposition, no more than two will ever be needed in the same army stack.

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