I was looking for the source, I can't find it, but there was a (I think 17th century) French monk was into climbing, and based on his diary entries and the loca

I was looking for the source, I can't find it, but there was a (I think 17th century) French monk was into climbing, and based on his diary entries and the local crags near the monastery they guessed he was pulling 5.13a, which, for climbers today usually it takes several years of dedicated training to get to that level.