Ralph I, Lord of Coucy
Ralph of Coucy,( c. 1134 – 1191), lord of Coucy, lord of Marle, La Fère, Crécy( sur- Serre), Vervins, Pinon, Landouzy( la- Ville), and Fontaine( lès- Vervins).
He was the son of Enguerrand II, Lord of Coucy and Agnes de Beaugency.
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.
Enguerrand VI de Coucy
Enguerrand VI was a French nobleman who served as the Seigneur Lord of Coucy.
He was also Lord Gynes, Sire d' Oisy, in the district of Marle, and the Sire de La Fère.
He was the son of his predecessor, Guillaume, Lord of Coucy, Marle, Fère, Oisy, and Mount- Mirel, who held the titles from 1321 – 1335; and his second wife, Isabeau de Châtillon- St- Pol, daughter of Guy IV, Count of Saint- Pol.
He succeeded his father in the titles in 1335.
In 1338, he married Catherine of Austria, oldest daughter of Leopold I, Duke of Austria and Catherina of Savoy, and the granddaughter of the powerful Amadeus V, Count of Savoy.
The marriage with the House of Habsburg and House of Savoy was arranged by King Philip VI himself, who was seeking foreign allies against England and to secure the loyalty of the barony of Coucy, strategically located in Northern France and fortified with the Château de Coucy.
Two pacts arranging the marriage and dowry were signed, the first in January 1337 in Paris and the second on 25 November 1338 in the Bois de Vincennes.
The marriage produced one son only, Enguerrand VII, who succeeded his father.
Enguerrand VI was reportedly killed at the Battle of Crécy on 25 August 1346, but his death is also recorded as occurring as early as 1344 or as late as September 1347.
Sir Thomas Green
Sir Thomas Green( c.1461 – 9 November 1506) was a member of the English gentry who died in the Tower of London, where he had been imprisoned for treason.
He is best known as the grandfather of Catherine Parr, last wife of King Henry VIII.
Enguerrand V de Coucy
Enguerrand V, Lord of Coucy( after 1321) inherited the title of Lord of Coucy and castle from his maternal uncle, Enguerrand IV in 1311.
He was also lord of Oisy and Montmirail.
Leopold I, Duke of Austria
Leopold I (4 August 1290 – 28 February 1326) from the House of Habsburg was Duke of Austria and Styria – as co-ruler with his elder brother Frederick the Fair – from 1308 until his death.
Born at Vienna, he was the third son of King Albert I of Germany and Elisabeth of Gorizia-Tyrol, a scion of the Meinhardiner dynasty.
Thomas, Lord of Coucy
Thomas of Marle, Lord of Coucy and Boves, was born in 1073 to Enguerrand I of Boves, the Lord of Coucy and his wife Adele of Marle.
After the death of his father, Enguerrand I, Thomas would become the Lord of Coucy and his family's other holdings.
As the best- known of the Lords of Coucy, Thomas of Marle would become infamous for his aggressive and brutal tactics in war and his continued rebellion against the authority of Louis VI.
Enguerrand III, Lord of Coucy
Enguerrand III de Boves, Lord of Coucy( c.1182–1242) was the eldest son and successor of Ralph I, Lord of Coucy( c. 1134 – 1191) and Alix de Dreux.
He succeeded as Lord of Coucy(" sieur de Couci") in 1191, and held it until his death; he was also lord of Marle and Boves.
Enguerrand IV de Coucy
Enguerrand IV, Lord of Coucy( c. 1236 – 1311) was the son of Enguerrand III, Lord of Coucy and Marie de Montmirail.
He succeeded his older brother Raoul II, Lord of Coucy, serving as the Sire de Coucy from his brother's death in 1250 until his own in 1311.
Catherine of Austria, Lady of Coucy
Catherine of Austria (9 February 1320 – 28 September 1349) was the oldest daughter of Leopold I, Duke of Austria and his wife Catherine of Savoy.
She was a member of the House of Habsburg by birth and married the Lord of Coucy.

Question: Who is Catherine Of Austria, Lady Of Coucy's paternal grandfather?
Answer: Albert I of Germany