The Devil's Mercenary — Anne Herries

Venetia dei Giorlandi was the spoilt daughter of a wealthy Venetian merchant. Proud and beautiful, she scorned the Spaniard her father appointed as her protector on the dangerous sea voyage. Caught up in a holy war betwen the Turks and the forces of Christendom, Venetia had to learn patience and humility before she could win her way to happiness with the mysterious Roldan Domingo and learn the terrible secrets of his past...