Duan Binyan was a Mesan citizen and freighter captain.
In 1920 PD, he commanded the slaver Marianne, smuggling weapons to Kornati in the Split System and Montana in the Montana System to support the Freedom Alliance of Kornati and the Montana Independence Movement.
In the orbit of Montana the vessel, disguising itself as the freighter Golden Butterfly, was inspected by the crew of HMS Hexapuma. Binyan's security and tactical officer, Zeno Egervary, panicked and fired on the pinnace Hawk-Papa-One with hidden point defense systems, destroying it and killing its crew. Binyan instantly overwhelmed – and killed – Egervary, but Hexapuma had already opened fire, shooting Marianne into wreckage with her point lasers. Only fourteen of the freighter's crewmembers were still alive by the time Binyan surrendered and begged the Manticorans to stop firing.
Binyan and his surviving crew were taken into custody aboard Hexapuma and, upon facing charges of piracy and a possible death sentence, became very cooperative, telling the Manticorans about their weapons smuggling and the secret military build-up in the Monica System. (SI1)