matholwch's son in the second branch of the mabinogi, the boy whom efnisien tosses in the fire thereby precipitating the battle between the welsh and irish that ends in the death of bran and all his men but seven, and the devestation of ireland. as i recall, efnisien plunges gwern headfirst into the fire, which gives a nice false etymology for any place called pengwern, no? leslie jones ljones@law.uoregon.edu