I'm working on a new Ars Magica campaign that I intend to set sometime in the early 11th century. I was wondering if anyone had any more precise dates for some of the things that happened in the Order of Hermes during the 9th, 10th, and 11th centuries. I'm specifically looking for dates on the attempted Tremere takeover, the Tytalus Diabolism scandal and the Schism war that eliminated the Diedne.
Do you have 'Order of Hermes' from 2nd edition Ars Magica? On p. 122-123 it has a list of events throughout the Order's history. It is anyway still the best source on history of the Order before 1200 AD - so definitely worth getting it.