 According to tradition, Paris was converted to Christianity in about 250 AD by Saint Denis, a bishop sent to Christianize Gaul by Pope Fabian.He was martyred and buried at Saint-Denis, where a basilica was founded to mark his grave.The first Christian church is believed to have been built where Notre Dame Cathedral is today, on the site a Roman temple to Jupiter; stones from the Roman temple were found beneath the choir of Notre Dame when the choir was renovated in 1711 and are now on display in the Cluny Museum.