Elisabeth of Austria was born a duchess in 1837. At the age of 16, she was married to Emperor Franz Joseph I before becoming the longest-reigning Empress of Austria. But her life was no royal fairytale.

Instead, her life was full of tragedy, including an unhappy marriage, run-ins with her in-laws, health issues, a dangerous obsession with staying young and beautiful, and even the deaths of her children. Through it all, she forged a relationship with Hungary, becoming their Queen in 1867. But her unhappiness drove her to leave court often. She traveled as much as possible and built herself an island refuge to escape it all.

But not everyone loved her.

Here are 15 of the most fascinating facts about her intriguing royal life: