In 1537 AD, he took the throne after disposing his mentally ill half-brother [[Erik XIV]]. His reign was notably [[Catholicism|pro-Catholic]], in clear opposition of his father, who had brought the [[Protestant Reformation|Reformation]] and [[Lutheranism]] to Sweden. His first wife was a Catholic, princess Catherine Jagellonica of [[Poland]]. | In 1537 AD, he took the throne after disposing his mentally ill half-brother [[Erik XIV]]. His reign was notably [[Catholicism|pro-Catholic]], in clear opposition of his father, who had brought the [[Protestant Reformation|Reformation]] and [[Lutheranism]] to Sweden. His first wife was a Catholic, princess Catherine Jagellonica of [[Poland]]. |