The Living Covenant: Semita Errabunda
Semita Errabunda is the official example covenant for Ars Magica fifth edition. It is located "somewhere in Mythic Europe" — its location is deliberately left vague. It does control a region that sometimes leads to places all over Europe, however, so its members can crop up anywhere. The members of Semita Errabunda supply most of the example characters in fifth edition supplements.
The covenant itself is surrounded by strange magic powers and inhabited by young, new wizards.
This is a collection of documents demonstrating how an Ars Magica covenant is defined. The documents are available as a set of PDFs with an overall description and separate pages describing the members of the covenant.