Boars Head Carol has a connection with Aristotle

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Where an amusing tradition formerly current in Oxford concerning the boar's head custom, which represented that usage as a commemoration of an act of valour performed by a student of the college, who, while walking in the neighbouring forest of Shotover and reading Aristotle, was suddenly attacked by a wild boar. The furious beast came open-mouthed upon the youth, who, however, very courageously, and with a happy presence of mind, thrust the volume he was reading down the boar's throat, crying, "Græcum est," and fairly choked the savage with the sage.