Tarr, Judith. "Roncesvalles"
Divergence: 778 CE
What if: Upon hearing of Roland's death and Ganelon's treachery, Charlemagne converted to Islam.
Summary: Describes the event, but no follow through.
Published: In What Might Have Been? Volume 2: Alternate Heroes (eds. Gregory Benford and Martin H. Greenberg), q.v.; and The Mammoth Book of Alternate Histories (eds. Ian Watson and Ian Whates), q.v.