Saint-Genis-Laval is a commune in the metropolis of Lyon in the Auvergne-Rhône-Alpes region of eastern France. The Lyon Observat…Saint-Genis-Laval is a commune in the metropolis of Lyon in the Auvergne-Rhône-Alpes region of eastern France. The Lyon Observatory is located in this commune. Saint-Genis-Laval draws its name from Saint Genis or Genest, a Roman actor tortured under Diocletian. At the beginning of the 13th century, to differentiate it of other villages of the same name, the town added a qualitative to its name, «of the valley», which in the 15th century became "Laval".
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