Kate Middleton underwent a fertility test before marrying Prince William.

The British Royal Family wanted to ensure she complied with every detail.

The royal family saw Kate as the ideal bride to wear the crown.

Kate underwent the medical test to guarantee the preservation of the Windsor family lineage.

The test was successful, and Kate gave the British Crown three heirs.

The author of 'Gilded Youth' details a painful passage from Kate and William's courtship.

The test was required to ensure a future queen's ability to have children.

Other princesses may have undergone the same test.

The test could be considered old-fashioned and discriminatory in today's society.