Death
Her second pregnancy was extremely difficult; on 14 March 1190, Isabella gave birth to twin boys named Robert and Philip. Due to complications in childbirth, Isabella died the next day, and was buried in the cathedral of Notre Dame in Paris. She was not quite 20 years old and was mourned for greatly in the capital, since she had been a popular queen.
The twins lived only four days, both having died on 18 March 1190. Her son Louis succeeded her as Count of Artois. Isabella's dowry of Artois eventually returned to the French Crown following the death of King Philip, when her son Louis became king.
Read more about this topic: Isabella Of Hainault