Chateau de Pierre-Scize. The castle of Pierre Scize, also called the castle of Pierre Encise, now disappeared, was located in the municipality of Lyon, in the current metropolis of Lyon.
   It occupied a strategic position, facing the Saône at the western entrance to Lyon, which marked the border between the Kingdom of France and the Holy Roman Empire. Perhaps the home of the former kings of Burgundy, certainly that of the archbishops of Lyon, recovered by Louis XI as a state prison, it was demolished in 1793.
   The name of the rock on which the castle was built originates from the name Petra incisa, split/incised stone, which recalls the great work of the Roman roads set up by Agrippa - by which it should be understood that the Romans began to notch the rock to make pass a way. Indeed according to Clerjon, the spur of Pierre Scise then advanced to the middle of the Saône.
   The Pierre Scise spur is part of the crystalline base on the eastern edge of the Massif Central. On the heights dominating the castle, this granite is covered by the sedimentary massif of the Monts d'Or which dominates the valley of the Saône by a steep slope almost -continued from Fourvière to Millery; this slope corresponds to an exhumed fault line escarpment.
   The crystalline base is found on the left bank of the Saône at the level of the Pierre-Scize gorge and in the very bed of the Saône, upstream at Île Barbe. Further downstream, at
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