Who Were the Sea Peoples?

I am just beginning to understand the connection between Luther's doctrine of sola scriptura (scripture alone) and the modern faith in written constitutions: both regard it as conceivable that one could once and for all set out in writing everything of any importance about how to proceed in some domain, and then somehow, despite all changes in circumstances and changes in knowledge and understanding, go on interpreting that founding document in an "original" fashion. To be explored further: Lutheranism as "rationalism in religion," akin to the "rationalism in politics" critiqued by Oakeshott.