Poisoning was a traditional method, especially of insuring inheritance, since imperial rome, and earlier. favoured for pesky relatives that refused to die on time. quite a few emperors, as well as their rivals, usually relatives, were poisoned. the catholic church was fond of it as well, as priests were (and are) frowned on if they shed blood.
p.s. - poppy, my saluki lurcher cross is my avatar, she has the saluki breed standard feathering on her ears, tail, legs and feet. and she CAN fly along. roughly 40 mph, tho she rarely gets too far off the ground.