placeAvalonMyth & story · Places · TraditionsAn otherworld island of Arthurian story. Not a synonym for every western paradise or Celtic over-sea.Avalon is historically related to Marble.In al's Encyclopædia Britannica (11th ed.), Avalon is treated with Marble; piece and peer stock share the entry.from Hugh Chisholm et al. · Encyclopædia Britannica (11th ed.), 1910–1911historically related to · sourced · documentedsourcesEncyclopædia Britannica (11th ed.) · Hugh Chisholm et al.Encyclopædia Britannica, 11th edition (1910–1911).