Order of Hermes (Ars Magica)

The Order of Hermes is a fictional mystical group of wizards in the role-playing game "Ars Magica" by Atlas Games, set in Mythic Europe. 
History.
The Order of Hermes was founded by the wizards Trianoma and Bonisagus. Trianoma had the desire to unite the disparate Magi of Europe into a single group, who could learn from one another. She did not know how to accomplish this goal until she met Bonisagus. He had created a consistent theory of magic which would allow magi to share information, using a common frame of reference. Also, he had invented the ritual "Parma Magica," a personal, protective, magical shield. Having "Parma Magica" would allow magi to meet face to face without fear of magical attack. Trianoma became Bonisagus' student, learned his theory and the "Parma", then traveled throughout Europe recruiting other wizards. Eleven Magi joined her. Bonisagus and the eleven Magi established twelve Houses in a fellowship called the Hermetic Order of Hermes. The Order quickly recruited like-minded wizards, teaching the protective "Parma Magica" to Magi, who would take the Order's Oath of mutual cooperation. The wizards who refused to take the Oath were not taught the "Parma Magica". Instead, they were hunted down and destroyed. 
Houses.
Every member of the Order belongs to one of the twelve "Houses". The Houses were established by and named after Bonisagus and eleven of the twelve other Founders. Each House is led by a "Primus" (Latin = "the first", female "Prima", general plural "Primi"). The Primi's authority and duties vary greatly between the Houses, ranging from absolute authority (House Tremere) to mere representation (House Verditius). The Primus lives in the "domus magna" (Latin = "Great House"), the headquarters of each House. 
Bonisagus, Guernicus, Mercere, and Tremere Houses are the True Lineages. This means that each Magus was taught by a Magus of that House, and that master-apprentice relationship goes back to their founding Magus. These Houses are the backbone of the Order of Hermes. Houses Bjornær, Criamon, Merinita, and Verditius are the Mystery Cults of the Order. They are groups of Magi who have been initiated into at least one of their household's Mysteries. Ex Miscellanea, Flambeau, Jerbiton, and Tytalus are social Houses. These Magi are brought together by shared interests, common philosophies, and camaraderie. 
Tribunals.
The Order is divided into 13 "Tribunals", each of which administers a region of Mythic Europe. Once every seven years, the Magi within a Tribunal hold a meeting, called a Tribunal, where new Magi are presented, new Masters are recognized, and new Archmagi are honored. The Quaesitores judge disputes, which cannot be resolved within a covenant, a magical community. The Tribunal is presided over by a Praeco, usually the eldest Magus or Maga present. The legality of the Tribunal is supervised by the ruling Quaesitor, who determines whether a quorum is present to legitimize the proceedings.
Once every 33 years, each Tribunal sends a representative to a "Grand Tribunal", which takes place in Durenmar, the domus magna of House Bonisagus. The Grand Tribunal proceeds much like a regional Tribunal, but the Primus of House Bonisagus is always the Praeco, and the Primus of House Guernicus is the ruling Quaesitor.
The 13 Tribunals: