Brandishing a sabre, Yanek Zylinski laid down the gauntlet to Nigel Farage in a Youtube video, saying he had "had enough of discrimination against Polish people" and that he would fight in "defence of my people in this country".
"Enough is enough, Mr Farage," he added. "I'm offering a duel."
London-based Zylinski, who said his father led a cavalry charge against the Germans in 1939, said that if Farage was against the idea, or if his "sword was a bit rusty" that they could instead engage in a televised verbal joust.
"It is an impressive sword," he said. "I don't have one but I'm sure we could find one if we had to. But I'm not intending to accept the offer."
"I would have thought that a Polish prince with a long Polish lineage would rather agree with me that it's a complete tragedy for Poland that it's lost so many of its brightest and best young people," added Farage.
During his walkabout, Farage met Ivan Loncsarevity, 62, a Hungarian factory worker.