Ysgarth is a fantasy role-playing game written by Dave Nalle with contributions from other authors. It was originally released in 1979 by Ragnarok Games. The company also published subsequent editions of the game throughout the 1980s and 1990s, but no new edition has seen print since the 6th edition in 1995, although various revisions and addenda are available on the internet, including partial versions of an unpublished 7th edition of the game. Ragnarok Games also published a number of other board and roleplaying games during the period when Ysgarth was in print, as well as a roleplaying magazine called Abyss Quarterly. Many of those involved in the development of Ysgarth were also subsequently involved in the development of the Quest for the Grail Arthurian CCG published by Stone Ring Games.
Source: Wikipedia, "Ysgarth", available under the CC-BY-SA License.