cult of the dead, making our nomadic tribe

"To summon a dead religion from its forgotten grave and to make it tell its story, would require an enchanter's wand. Other old faiths, of Egypt, Babylon, Greece, Rome, are known to us. But in their case liturgies, myths, theogonies, theologies, and the accessories of cult, remain to yield their report of the outward form of human belief and aspiration. How scanty, on the other hand, are the records of Celtic religion! The bygone faith of a people who have inspired the world with noble dreams must be constructed painfully, and often in fear and trembling, out of fragmentary and, in many cases, transformed remains."

http://www.gutenberg.org/files/14672/14672-h/14672-h.htm#chap1