Henry VIII's sister-in-law was Catherine of Aragon, who was the first wife of the infamous Tudor king. Catherine was the daughter of King Ferdinand II of Aragon and Queen Isabella I of Castile, making her a princess of Spain. She married Henry's older brother, Arthur, Prince of Wales, in 1501, but he died just a few months into their marriage.

After Arthur's death, Catherine remained in England and eventually married Henry VIII in 1509. Their marriage lasted for over 20 years, but it was tumultuous and ultimately ended in divorce. Henry's desire for a male heir led him to seek an annulment of his marriage to Catherine, as she had only been able to provide him with a daughter, Mary. This led to the break with the Catholic Church and the establishment of the Church of England.

Despite their marriage being annulled, Catherine of Aragon remained in England and was treated with respect by Henry VIII. She was given the title of "Princess Dowager" and lived out the rest of her days in various castles and manors throughout the country. Catherine passed away in 1536 at Kimbolton Castle, and Henry VIII famously did not attend her funeral.

For more information on Henry VIII and his wives, including Catherine of Aragon, you can visit the History Extra website. There you can find in-depth articles, videos, and podcasts on the Tudor period and the lives of Henry VIII and his wives.

In conclusion, Catherine of Aragon was Henry VIII's sister-in-law, as she was the wife of his older brother, Arthur. Their marriage was tumultuous and ultimately ended in divorce, leading to the break with the Catholic Church and the establishment of the Church of England. Despite their differences, Catherine was treated with respect by Henry and lived out her days in England until her passing in 1536.

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