As it says on the tin, Archduke John Charles, was until 1619, the eldest surviving son of Emperor Ferdinand II-he of the ultra counter reformation- having been born in 1605, one would assume that his cousin Maria Anna of Spain would be his wife, if he survives past 1619. My question is, what sort of person was he like, are there any sources that can help with that? Which would then help answer, what sort of policies might he pursue as emperor? What would become of his brother Ferdinand? Would his younger brother marry either his second or third wife sooner?