1310s, Dante Alighieri, “Canto XI”, in Purgatorio[Purgatory], lines 25–26, 28–30; republished as Giorgio Petrocchi, editor, La Commedia secondo l'antica vulgata [The Commedia according to the ancient vulgate], 2nd revised edition, Florence:publ.Le Lettere, 1994:
Così a sé e noi buona ramogna quell’ombre orando, andavan sotto ’l pondo, […] disparmente angosciate tutte a tondo e lasse su per la prima cornice, purgando la caligine del mondo.
Thus those shadows — uttering good wishes for themselves and for us — were going, under the weight, unequally burdened and tired, all around the first terrace, purging themselves of the world's obfuscation.
(regional)soot(fine black or dull brown particles produced by incomplete combustion)