The Ring of Humility is one of the eight talismans of Sir Cabirus, representing the virtue of Humility. The ring was worn by the simple Bill, who never wanted reward for his free work. It is a strong symbol of virtue.
The Ring of Humility was found in the fifth level of the Abyss in Ultima Underworld I, after the Avatar managed to solve the lever puzzle protecting it. It was cast into the lava of the Abyss later, to banish to Slasher of Veils.