Danish farmer's son Rasmus Berg has been given a costly education in Copenhagen, and when he returns, he speaks Latin to his parents, and Latinises his name as Erasmus Montanus. He wants to "dispute", and goes on to "prove" a number of absurdities, such as that his mother is a rock. He is contrasted to his brother Jacob who is only interested in knowledge which is of practical application. (en.wikipedia.org)