To Lie with Lions
Dorothy Dunnett1995

The year is 1471. Within the circus of statecraft, where the lions of Burgundy, Cyprus, England, and Venice stalk and snarl, Nicholas wields a valued whip. Having wrested his little son Jordan from his estranged wife, Gelis, he embarks on the greatest business scheme of his life-- beginning with a journey to Iceland. But while Nicholas confronts merchant knights, polar bears, and the frozen volcanic wastelands of the North, a greater challenge awaits: the vengeful Gelis, whose secrets threaten to topple all Nicholas has achieved.

Titre original : To Lie with Lions (1995)