Murder the 14th Century way:

[Metalmickey]

The aristocrat's POISON RING that could deliver a deadly dose to a rival's wine goblet

    The 14th Century piece of jewellery was found at the site of a medieval fortress on Cape Kaliakra on the Bulgarian Black Sea coast
    Archaeologists believe the ring would have likely belonged to a wealthy and power-hungry male and was filled with poison
    Dr Boni Petrunova said the ring is proof that poison was used in politically-motivated murders in medieval Bulgaria

http://www.dailymail.co.uk/sciencetech/article-2400953/Murder-14th-Century-way-Aristocrats-POISON-RING-deliver-deadly-dose-political-rivals-wine-goblet.html