The Venatorii Noctus is a covert group of monster hunters. They were founded in Rome in the late 200s AD officially though previously it may have existed as a loose coalition. The order is still heavily based in Rome which is where its head quarters are.
Things have moved on since those days to modern times when mass media, and the latest forensics make it much more difficult for a man and his crossbow to put a bolt in something. Furthermore by the end of the Medieval era it had become clear that the Venatorii could not hunt every dangerous creature at once so many have bargains struck with them to limit their behaviour and protect them simultaneously. Often these agreements are reinforced magically and these agreements have in some cases held for centuries. Nowadays there is a “White List” of those creatures who have been proven to be peaceable or at least compliant with their oaths.
The Order is also not entirely human either a number of its members are Blooded. Most of the Hunters who are part of the Venatorii are part of a cell. This is a small group who are shuttled between different hot spots, trying to keep everything contained. The cells are largely independent answering only to the Masters, the heads of the order.