So apparently Hamlet is based on a story from Saxo Grammaticus' Danish History! Hamlet's predecessor Amleth was a pagan and prince in a pagan court. http://www.pitt.edu/~dash/amleth.htmlSaxo did accuse Amleth's Uncle of incest, so clearly he didn't think that marrying your brother's widow was ok. But maybe that's Saxo's Christian gloss (apparently taking Leviticus over Deuteronomy). However the story does not mention that the subjects of the new King had any problem with him marrying his brother's widow. In fact after Amleth gets revenge and kills his Uncle, he has to hide out because he is worried about the people would think. And later he gets accused of usurping Jutland from his Uncle by the successor of his maternal Grandfather.