Plague doctor...the "beak" would contain herbs that would help to protect the Doctor from contracting the disease. It was basically useless...of course they didn't realize how disease was spread and the different methods of cross contamination, etc...
10 things you (probably) didn’t know about the Black Death - It is one of the worst catastrophes in recorded history – a deadly plague that ravaged communities across Europe, changing forever their social and economic fabric. But how much do you know about the Black Death? | History Extra
Plague doctors in the and century wore these creepy masks to avoid breathing in putrid air, which they believed would cause infection. The beaks were filled with perfume. Popular scents were balm mint leaves, ambergris, cloves, camphor, myrrh, and rose.
These bawdy pilgrimage badges found in the Netherlands, France and England, dating from roughly 1350-1500, functioned as apotropaic, or protective devices, meant to safeguard their owners from the threat of the evil eye, which during the worst outbreaks of the Bubonic Plague, was thought capable of transmitting the disease.