Determination of Edward VIII, king of Great Britain and Ireland, in 1936 to marry Wallis Warfield Simpson, a divorced American, precipitated a constitutional crisis.

Wallis, duchess of Windsor (born Bessie Wallis Warfield, later Spencer, then Simpson), an American socialite, married the prince, duke of Windsor, and former king as her third husband.

Periods of separation punctuated her first marriage, which to a naval officer of United States eventually ended in divorce. In 1934 during her second marriage, she allegedly succumbed as the mistress of Edward, Prince of Wales. After accession of Edward as king, Wallis in 1936 divorced her second husband and received his proposal.

https://en.wikipedia.org/wiki/Wallis_...