The Spanish nickname of "mad" Princess Juana, it's also the title of a Menotti opera about her
[DOC] [TLE] Joanna of Castile - Wikipedia [PAR] Joanna of Castile (6 November 1479  12 April 1555), called the Mad (Spanish: 
Juana la Loca), was queen of Castile from 1504 ... Queen Isabella came to 
ensure that Joanna along with her three sisters Isabella, .... and also minted coins 
in the name of "Philip and Joanna, King and Queen of Castile, .....