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One of the earliest datable uses of the melody itself was in the combinative chanson "Il sera pour vous conbatu/L'homme armé" ascribed to Robert Morton, which now is believed probably to date from around 1463, owing to historical references in the text. Another possibly earlier version of the tune is an anonymous three-voice setting from the Mellon Chansonnier, which also cannot be precisely dated. In 1523 Pietro Aron, in his treatise "Thoscanello" suggested that Antoine Busnois was the composer of the tune; while tantalizing, since the tune is stylistically consistent with Busnois, there is no other source to corroborate Aron, and he was writing approximately 70 years after the first appearance of the melody. Taruskin has argued that Busnois wrote the earliest known mass on the melody, but this is disputed, many scholars preferring to see the older Guillaume Du Fay as the creator of the first "L'homme armé" Mass. Other composers whose settings of the tune may date from the 1450s include Guillaume Faugues, Johannes Regis, and Johannes Ockeghem.