The death of his older brother , Alexander ( 8 October 1565 ) , made him the new heir apparent to the Electorate of Saxony .
He was the sixth but second surviving son of Elector Augustus of Saxony and Anna of Denmark .
The death of son 's older brother , Alexander ( 8 October 1565 ) , made him the new heir apparent to the Electorate of Saxony .
He was the sixth but second surviving son of Elector Augustus of Saxony and Anna of Denmark .