Riddle No 29: A lawer with no diploma.

I was named after the father of many nations at a distance continent. My family name is that of a Welsh lake. I did not attend even one day in school. Yet I was one of the prominent lawyers of my time. I almost lost any chance for political career due to laud anti war speech. Later on I di not hesitate to wage war against my own people including my wife's family. Who am I?