The Bauta, it's one of the most ancient kind of mask in Venezia.
It's not directly link to plague, but have an elaborate meaning, because was uased in different occasion, not only during carnival, but in the past also in the ordinary life.
The main purpose was to let people unrecognizable and make all people free and without differences between poor and rich men.
There is a mask that it's strongly and directly link with the plague, the name is "el medico dea peste" in english is "the doctor of the plague"
I took a pic also of this mask, I'll upload soon, ok?