 In 563, according to the writings of Gregory of Tours and Marius Aventicensis, a tsunami swept along Lake Geneva, destroying many settlements, and causing numerous deaths in Geneva.Simulations indicate that this Tauredunum event was most likely caused by a massive landslide near where the Rhone flows into the lake, which caused a wave eight meters high to reach Geneva within 70 minutes.Geneva became an episcopal seat in the 4th century.