Jean-Baptiste Martenot, was a French architect, born in Bourgogne, in the city of Rennes. The Halles Martenot and the Préfecture Martenot are names in his honour. He is a former student of the école des Beaux-Arts.
From humble beginnings, he obtained a departmental pension to study at the École nationale des Beaux-Arts in Paris, which he attended until 1850. He won the prix Muller Sœhnée.
At 26, Martenot was named inspector of the Palais du Louvre.
Wikipedia https://en.wikipedia.org/wiki/Jean-Baptiste_Martenot
Address 47 Avenue Gros Malhon, Rennes 35000, France
Coordinates 48°7'32.082" N -1°40'55.219" E