To make it work, prisoners were completely restrained and tied to the ground or any horizontal surface. A rat was then placed on the stomach covered by a metallic container, which was gradually heated. The rat began to look for a way out, which inevitably meant through the victim's body. Digging through the body usually took a few hours, resulting in a painful and gruesome death.

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8. Coffin Torture

This was one of the most dreaded forms of torture during the Medieval Period.

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The accused were placed inside a caged coffin, rendering them completely immobile. The period of time was determined by the crime, with some infractions, like blasphemy, punishable by death. Victims were often put on public display, where they would be mocked and abused by angry locals.

9. Breast Ripper

This one's particularly nasty — not that the other items on this list aren't. Also known as the Iron Spider, it was mainly used on women who were accused of adultery, self-abortion, heresy, blasphemy, or accused of being witches. It was also used for interrogations.

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The device, which was often heated during torture, contained four "claws" which were used to slowly and painfully rip off the breasts. The instrument would be latched onto a single breast of the woman. Blood sometimes splattered onto her children. If the woman did not die, she would be disfigured for the rest of her life. Image credit: Flominator.

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Other variations of this torture also existed.

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10. Knee Splitter

Popular during the Inquisition, this device consisted of two spiked wood blocks which were placed in front of and behind the knee.

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The blocks, which were connected by two large screws, would be turned and made to close towards each other, destroying the knee underneath. The technique would render the knees useless. The number of spikes on the blocks varied from three to twenty, often depending on the nature of the crime and the status of the prisoner. Image credit: FutureX.

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All images are mine unless otherwise noted.