The Poison-Detecting Secret Weapon of the Middle Ages: Unicorn Horn

It was the must-have accessory for royals watching their back.

The Wonders of Unicorn Horns: Preventions and Cures for Poisoning

The Unicorn Horn — a poison detector and antidot.: englishhimki — LiveJournal

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The Royal Art of Poison

The Middle Ages in Modern Games: Conference Proceedings, Vol. 2 (2021) by University of Winchester - Issuu

Unicorn horn - Wikipedia

Medieval Anti-Poisons - Jewelpedia

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The Deadly Story of Poison