The Cliffs of Insanity are period

From a book on the Knights Templar which I am currently reading:

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While in camp, or while in a castle in wartime, the brothers were not allowed to go out without permission, in case of ambush. Nor were they allowed to go out foraging or to reconnoitre on their own initiative. A lone horseman was very vulnerable to attack. Bishop Jacques de Vitry recounted an anecdote of a Templar caught in a Muslim ambush who saved himself by making his horse leap off the cliff road into the sea (the horse died, but he survived).
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