Sir Cabirus is the founder of the colony in the Abyss in Ultima Underworld I. His project in the end was a total failure however, ending in death and destruction. Sir Cabirus had the idea of founding a fortress of the Eight Virtues in the place that was most opposed to it: the Stygian Abyss on the Isle of the Avatar. After getting the permission from Lord British and enough volunteers, he started the project. For years everything went well, but then it became obvious that only his personal leadership and prestige had held the colony together.