What is the theme in The Virgin's Lover by Philippa Gregory?

Another theme to consider is the constant heart. The theme of "A Constant Heart" means the expression of fidelity, loyalty and faithfulness seen in some of the characters during the course of the narrative. Best expressed by Amy Dudley, "A Constant Heart" shows itself in the ways that she is always faithful and loyal to her husband, even when rumors of his affair are flying across the entire country. Although faithfulness and loyalty are prime virtues and show strength of character,