Game manual (Battle Axe)
A dwarf from the mines of Wolud, Gilius Thunderhead lost his twin brother in the battle to defend their homestead against the blood crazed soldiers of Death Adder. Members of the Dwarvish race are very closely bonded to their relatives by emotional ties - and in the case of twins, this bindings is immensely strong. Gilius Thunderhead has sworn by all he holds sacred to join his brother in death by king Death Adder and then committing suicide.
The dwarf retired before this adventure; he dropped his axe into the mithril fires of his home land, and stole a walking staff from one of the elves that tried to rob him while he was camping. He tried to give the Axe back to the gods, but a shipwreck caused him to be injured losing the weapon to Damud. Through his ancient wisdom, the dwarf has adopted the role of sage, guiding the characters on their quest.
Source: Wikipedia, "Golden Axe III", available under the CC-BY-SA License.