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Pro: “Freeze Corleone is France’s fastest growing artist in the last 2 years,” the executives, Sylvain Gazaignes and Ronan Fiacre, wrote in the memo.

Neither Mr. Gazaignes nor Mr. Fiacre responded to text messages seeking comment.

The guide, Fiacre Gbédji, was killed, and the two Frenchmen were later rescued, although two French soldiers were killed in a raid to liberate them.

Settled back in the slow, smoothly rolling fiacre we moved up the Avenue de l'Opéra, passed the locked doors of the shops, their windows lighted, the Avenue broad and shiny and almost deserted.

So-called ‘fiaker’, derived from the French term ‘fiacre’, have been a feature of Vienna life since it was the capital of a vast empire.