The Magistrato alla Sanità (Magistracy of Health) had broad powers over everything public health related, which besides the lazzaretti, also included inns, prostitutes, pharmacies, doctors, rubbish collection, water supply etc.
The Republic of Venice changed continuously as conditions inside and outside of it changed, until it gradually found its final form in the 1300s and 1400s.
The black plague ravaged Venice for centuries, from the mid 1300s to the late 1700s. This is a chronology of some of the most important events.