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Despite being a largely French-financed project, the series was shot in English with an eye toward a larger international audience. This drew the ire of many French critics, who felt the choice to shoot the series in English would have the effect of dumbing down the material.
As of 2015, this is the most expensive television show ever produced in France.
According to costume designer Madeline Fontaine, the production required the making of about 100 key cast member costume, and about 200 mass-produced extras costumes. Each costume, whether male or female, required about ten meters of fabric.
The costume team consisted of about 30 people, including the series' main designer, her auxiliary design team, stitchers and fitters.
The series' renewal for a second season was announced on October 6, 2015, ahead of its hotly-anticipated North American premiere.
The series was in development for five years before the cameras started to roll.