If you worried that royal houses had gotten a little too genteel by the 19th century, the story of Ranavalona I of Madagascar will disabuse you of that pretty quickly. Seizing the throne in 1828 after the death of her husband, King Radama - despite not being the rightful heir to it - she immediately launched a campaign of murder against her political rivals and potential successors, and summarily ended friendly relations with European nations, including expelling missionaries who had established schools. She didn't merely promote the local customs and faith traditions of the Malagasy people; she eventually banned the practice of Christianity entirely and executed those who practiced it. In fact, she executed a lot of people, in a variety of creative ways, and historians believe that in her 33-year reign of terror, she depopulated Madagascar by about half. It's no wonder that she's considered Madagascar's Bloody Mary, and Madagascar's Caligula.

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