Princess Wilhelmine of Prussia was the daughter of King Frederick William I of Prussia and his Sophia Dorothea of Hanover. She was the older sibling and lifelong confidante of her brother Frederick the Great. In 1731, she married Frederick, Margrave of Brandenburg-Bayreuth. When he inherited the title from his father in 1735, the couple carried out an ambitious -- and expensive -- building project that shaped the present-day town of Bayreuth. The margravine was also a composer, musician, and patron of music. She wrote her memoirs, which were first printed in 1810.