Maximilian I (22 March 1459 – 12 January 1519) was King of the Romans from 1486 and Holy Roman Emperor from 1508 until his death. He was never crowned by the Pope, as the journey to Rome was blocked by the Venetians. He proclaimed himself elected emperor in 1508 (Pope Julius II later recognized this) at Trent, thus breaking the long tradition of requiring a papal coronation for the adoption of the Imperial title. Maximilian was the only surviving son of Frederick III, Holy Roman Emperor, and Eleanor of Portugal. Since his coronation as King of the Romans in 1486, he ran a double government, or Doppelregierung (with a separate court), with his father until Frederick's death in 1493. Maximilian expanded the influence of the House of Habsburg through war and his marriage in 1477 to Mary of Burgundy, the ruler of the Burgundian State, heir of Charles the Bold, though he also lost his family's original lands in today's Switzerland to the Swiss Confederacy. Through marriage of his son Philip the Handsome to eventual queen Joanna of Castile in 1498, Maximilian helped to establish the Habsburg dynasty in Spain, which allowed his grandson Charles to hold the thrones of both Castile and Aragon. The historian Thomas A. Brady Jr. describes him as "the first Holy Roman Emperor in 250 years who ruled as well as reigned" and also, the "ablest royal warlord of his generation.".

Maximilian I, Holy Roman Emperor - Wikipedia