i have taken liberties using the root vedas , which are the religious myth-hymns of the indo-european aryans who came to hammaran india in 1500bc and from which modern hinduism in part derives ; i use vedas in conjuction with an abbreviation of the word druid or oak to recognize the similarity between the vedas and ancient celtic tales , no doubt the most ancient surviving legends once common to all the indo-european peoples of europe .