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The King Arthur Companion is an Arthurian encyclopedia, written by Phyllis Ann Karr, with art by Jody Lee, edited and assembled by Chaosium, and published by Reston Publishing in 1983. Subsequent editions expanded the contents, with the name changing in 2001 to The Arthurian Companion. In 2017, a new edition, renamed The Arthurian Concordance was funded as part of a crowdfunding campaign.