Wikipedia
RuneQuest
RuneQuest is a fantasy role-playing game first published in 1978 by Chaosium, created by Steve Perrin and set in Greg Stafford's mythical world of Glorantha. RuneQuest was notable for its original gaming system (designed around a percentile die and with an early implementation of skill rules). There have been several incarnations of the game. The most recent is the 6th edition that was released in July 2012 by The Design Mechanism under the title RuneQuest.
In Britain in the 1980s, RuneQuest was recognised by the gaming world as one of the 'Big Three' games with the largest market share, the others being Dungeons & Dragons and Traveller.