Here's a Thumbnail sketch, anyone who knows better (such as CJ) please correct me if I've got something wrong.
Historically, a gifted person found Virgil's tomb in the second half of the twelfth century and took out a book by virgil describing his magic (Virgil was a great magician it turns out, apparently this is consistent with period folklore). The Augutans are a new player in the setting as of 1220.
This fellow memorized the book and used the magic he got from it to start a tradition of court wizards with the goal of creating a new roman empire. Their present tool/ hero selected to accomplish this task is the Holy Roman emperor.
Their magic has three not completely related abilities.
They have a method of divining answers to questions by randomly choosing passages from the Aeneid and reading them. this is somewhat similar to Hermetic Divination from Mystery cults but is different enough that the separate mechanics are a boon. (in fact it looks to play more smoothly but I haven't tried it yet).
They have a method of making wards with if/then loops in them much like the watching ward spell. They have a whole mess of different sorts of effects that they can place in the wards but the range of effects is not as broad as hermetic magic (what is?). The big deal here is that they can throw up permanent until dispelled spell containers without any vis. They can make several wards a day and still have time to out in a full eight hours at the office so to speak. So, given sufficient preparation on the part of the storyguide, members of the Augustan Brotherhood can make life exceptionally difficult for hermetic magi who try to mess with their plans and inflict this difficulty without even being present to take their comeuppance from the aggrieved PC's.
Finally they have a method of creating animated objects. It looks long and hard process for the Augstans to pull off but the objects get might (they're animated by a sort of synthesized magical spirit) they can learn and they can be packed full of the effects detailed with their warding magic.