Question: Who is the paternal grandfather of George Of Austria?

Knowledge 1: George of Austria
George of Austria (Ghent, 1505 – Liège, 4 May 1557), was Prince-bishop of Liège from 1544 to 1557.He was an illegitimate son of Maximilian I, Holy Roman Emperor and Margaretha of Edelsheim.He became Bishop of Brixen (Tyrol) between 1525 and 1537 and Archbishop of Valencia between 1538 and 1544.In 1544 he became Prince-bishop of Liège by the influence of his nephew Charles V, Holy Roman Emperor, a post he held until his death.George strongly opposed any French influence in the Prince-Bishopric of Liège, thus maintaining the strong grip of the Habsburgs, who controlled all surrounding lands.<br>In 1554, he was faced with a French invasion under King Henry II of France. [SEP] Knowledge 2: Maximilian I, Holy Roman Emperor
Maximilian I (22 March 1459 – 12 January 1519) was Holy Roman Emperor from 1508 until his death.He was never crowned by the pope, as the journey to Rome was always too risky.He was instead proclaimed emperor elect by Pope Julius II at Trent, thus breaking the long tradition
of requiring a papal coronation for the adoption of the imperial title.Maximilian was the son of Frederick III, Holy Roman Emperor, and Eleanor of Portugal.He ruled jointly with his father for the last ten years of the latter's reign, from to his father'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 heiress to the Duchy of Burgundy, though he also lost the Austrian territories 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.
Knowledge 1: Archduke Otto of Austria (1865–1906)
Archduke Otto Franz Joseph Karl Ludwig Maria of Austria (21 April 1865 – 1 November 1906) was the second son of Archduke Karl Ludwig of Austria (younger brother of Emperor Franz Joseph I of Austria) and his second wife, Princess Maria Annunciata of Bourbon-Two Sicilies.He was the father of Charles I of Austria, the last Emperor of Austria. [SEP] Knowledge 2: Archduke Franz Karl of Austria
Archduke Franz Karl Joseph of Austria (17 December 1802 – 8 March 1878) was a member of the House of Habsburg-Lorraine.He was the father of two emperors:Franz Joseph I of Austria and Maximilian I of Mexico.Through his third son Karl Ludwig, he was the grandfather of Archduke Franz Ferdinand of Austria – whose assassination sparked the hostilities that led to the outbreak of World War I – and the great-grandfather of the last Habsburg emperor Karl I.
Knowledge 1: Maximilian I, Holy Roman Emperor
Maximilian I (22 March 1459 – 12 January 1519) was Holy Roman Emperor from 1508 until his death.He was never crowned by the pope, as the journey to Rome was always too risky.He was instead proclaimed emperor elect by Pope Julius II at Trent, thus breaking the long tradition
of requiring a papal coronation for the adoption of the imperial title.Maximilian was the son of Frederick III, Holy Roman Emperor, and Eleanor of Portugal.He ruled jointly with his father for the last ten years of the latter's reign, from to his father'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 heiress to the Duchy of Burgundy, though he also lost the Austrian territories 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. [SEP] Knowledge 2: Archduke Franz Karl of Austria
Archduke Franz Karl Joseph of Austria (17 December 1802 – 8 March 1878) was a member of the House of Habsburg-Lorraine.He was the father of two emperors:Franz Joseph I of Austria and Maximilian I of Mexico.Through his third son Karl Ludwig, he was the grandfather of Archduke Franz Ferdinand of Austria – whose assassination sparked the hostilities that led to the outbreak of World War I – and the great-grandfather of the last Habsburg emperor Karl I.

Answer: Frederick III, Holy Roman Emperor