As a prospective princess, Kate Middleton's character has stood up to the closest scrutiny. Unfortunately the same cannot be said for her ancestors.

A biography of Prince William's girlfriend reveals that her great great great grandfather was a jailbird.

According to the 1881 census, 55-year-old Edward Thomas Glassborow was doing hard labour in London's Holloway Prison at the time.

Unfortunately prison records have not survived from that era, so it is impossible to know why the father of seven, who worked as a messenger for an insurance company, was behind bars.

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