Joyeuse

Joyeuse was the name of Charlemagne's personal sword. The name translates as "joyful." Some legends claim that it was forged to contain the Lance of Longinus within its pommel - others state it was supposedly smithed from the same materials as Roland's Durendal and Ogier's Curtana.The 11th Century Song of Roland describes the sword:[Charlemagne] was wearing his fine white coat of mail and his helmet with gold-studded stones; by his side hung Joyeuse, and never was there a sword to match it; its color changed thirty times a day. Some seven hundred years later, Bulfinch's Mythology would reference Charlemagne using Joyeuse to behead the Saracen commander Corsuble, as well as knighting his comrade Ogier the Dane.
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adj. bright, joyful, blithe; glad, happy, joyous, cheerful; convivial, gleeful; jaunty, merry; rapturous, rollicking

The famous sword of Charlemagne.