Duelist n. (Written also duellist) One who fights in single combat. "A duelist... always values himself upon his courage, his sense of honor, his fidelity and friendship."
... both Adam Ferris and the Earl thought of the man in Vienna who had once dared, and whom the gentle-mannered duellist before them had sent quickly to his own place, with no more time given than to retract his words and receive holy absolution. For in the Austria of that time two gentlemen took a priest as well as a doctor with them to the field of honour. Then Adam Ferris remembered his lonely house below ... — Patsy • S. R. Crockett