Royal author claims Kate Middleton took pre-marital fertility test

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The test is carried out to ensure a future queen is able to have children.

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If Kate had not been fertile, the marriage would have been off.

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The late Queen Elizabeth II was said to be very impressed by Kate.

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Insiders praised Kate for her "stoicism" during their short break-up, cementing her future role as Queen Consort.

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[{"selector":"#anim-3b626458-1866-4786-926c-ee44e4b7fbed","keyframes":{"opacity":[1,1]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"both"}] [{"selector":"#anim-907077c2-24da-40c1-9919-d1042d82b565","keyframes":{"transform":["scale(3)","scale(1)"]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"forwards"}] [{"selector":"#anim-4a095c2f-682d-4f27-b0e9-c1eab84b3b86 [data-leaf-element=\"true\"]","keyframes":{"transform":["translate(-5.225988718301686%, 0%) scale(1.5)","translate(0%, 0%) scale(1)"]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"forwards"}] The author also alleges that Princess Diana was subjected to similar treatment.

[{"selector":"#anim-3c8f6723-47ce-4221-a356-8536789bd931 [data-leaf-element=\"true\"]","keyframes":{"transform":["translate(-22.334058085901212%, 0%) scale(1.5)","translate(0%, 0%) scale(1)"]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"forwards"}] [{"selector":"#anim-66b19d8c-4176-4300-9f57-49234dd3d1b5","keyframes":{"opacity":[1,1]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"both"}] [{"selector":"#anim-8dae27c2-c10e-4664-9dfc-8089808428ef","keyframes":{"transform":["scale(3)","scale(1)"]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"forwards"}] Diana thought her premarital check-ups had to do with general health, but she was actually being tested for fertility.

[{"selector":"#anim-b5efe26b-03e1-4c29-8a97-e30303d5ac20 [data-leaf-element=\"true\"]","keyframes":{"transform":["translate(16.329146242050413%, 0%) scale(1.5)","translate(0%, 0%) scale(1)"]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"forwards"}] [{"selector":"#anim-dedb9240-062a-4c3c-97f3-0cb00e952990","keyframes":{"opacity":[1,1]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"both"}] [{"selector":"#anim-a956f787-64e1-4aed-b391-8269e9f3c069","keyframes":{"transform":["scale(3)","scale(1)"]},"delay":0,"duration":2000,"easing":"cubic-bezier(.3,0,.55,1)","fill":"forwards"}] The author's book examines the royal family's childhoods using palace staff interviews and historical data.