Nicol Williamson's Merlin appears to summon ancient supernatural power by chanting the memorable phrase beginning 'Anál nathrach, orth' bháis bethad, do chél dénmha.' The incantation became one of Excalibur's most recognizable pieces of fantasy lore, often remembered by viewers as an authentic Celtic spell. Linguistic analysis, however, indicates that the charm has no attested historical source and was created for the film by John Boorman and screenwriter Rospo Pallenberg.
Linguist Michael Everson reconstructed the words as an attempt at Old Irish, while also noting that the pronunciation heard in the film bears little relationship to how the language would historically have been spoken. In modern terms, the phrase is generally interpreted as invoking the breath of a serpent or dragon and the force of life, but it is not a recovered medieval incantation. The sequence is therefore a particularly successful cinematic fabrication: an invented phrase delivered with enough conviction, ritual staging, and Wagnerian atmosphere to acquire the aura of genuine ancient magic.
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