Correct answer choice is :
While he has been considered as sensible and artistically skilled, as well as politically determined, early in his reign he bestowed signs of mental imbalance, a condition that ultimately led to disease. Some scholars challenge that his illness started early during his reign, while others believe that it first showed with the Sture Murders. Eric, having been ousted and detained, was most likely murdered. An analysis of his remains in 1958 verified that he apparently died of arsenic poisoning.