If I was in my peat home on the bog, I never knew anything about those things ... and no one bothered to tell me.
Even there people would know and be equipped to tell you:
Because there were teachers: http://www.fotopedia.com/items/flickr-227798282
And tools:
http://en.wikipedia.org/wiki/Faddan_More_Psalter
http://en.wikipedia.org/wiki/Cathach_of_St._Columba
But wars between Imperial factions accompanied by the Norman invasions destroyed economic and political stability and also destroyed a significant amount of what had been accomplished.
People who have lived their entire lives in a stable republic have difficulty appreciating how delicate these things can be.