Eldest son of Ferdinand I and Anna (Jagellon) of Hungary; husband of Maria of Spain.
 
As a young man, Maximilian found much to admire in Protestantism; so much so that his father feared that he might actually turn Protestant, and threatened to disinherit him unless he swore a solemn oath to live and die a Catholic.
 
During his reign, Maximilian managed to avoid wars, which gave his vast dominions a chance to prosper.  Because of this, and of his tolerance, he was very  popular among all of his subjects:  Catholics, Protestants, Austrians, Hungarians, Bohemians - everyone liked him.  (This made him unique among Holy Roman Emperors!)
 
When Maximilan was dying, he refused to call for a priest or to receive the last rites.  His wife, one of his sisters, the Papal nuncio and the Spanish ambassador all 'reasoned' with him, but he was adamant:  his priest, he said, was in Heaven.

Source: Sandra White