ducally

du·cal

 (do͞o′kəl, dyo͞o′-)
adj.
Of or relating to a duke or duchy: a ducal estate.

[Middle English, from Old French, from Late Latin ducālis, from Latin dux, duc-, leader; see duke.]

du′cal·ly adv.
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References in periodicals archive ?
Principally, or (if I may be allowed the amendment) perhaps Ducally, His Grace acknowledged himself beguiled by Cranach's portrait of our young Countess, praising the design, the hues, the glaze - the frame