 Complete the following phrase:  Gersuinda also Gersvinda, Gervinda; died after 800. Gersuinda was a concubine of the emperor Charlemagne, with whom he was in a relationship after the death of his last legitimate wife, Luitgard died June 4, 800. According to Charlemagnes contemporary biographer, Einhard, Gersuinda was a Saxon, a people whom Charlemagne subdued over a 