Question: What is the name of the paternal grandfather of Lady Margarita Armstrong-Jones ?

Context paragraphs:
Somali name: In Somali society, each individual has a given name.  Sometimes it is presented along with the father's given name, and sometimes the paternal grandfather's given name is attached as well.  For example Axmed Yusuf Qaasim would be a person whose given name is "Axmed", whose father's proper name was "Yusuf" and whose grandfather's name was "Qaasim".  Most names are of Islamic roots (e.g. Muhammed, Hassan, Ali, Ibrahim) whilst others are cultural (e.g. Guleed, Ashkir) .

Maestro Armando Ortega: Maestro Armando Manuel Aurelio Ortega Carrillo was Director of Coro de la Escuela Secundaria y de Bachilleres de Orizaba (ESBO).  His maternal great grandfather was the philanthropist Don Manuel Carrillo Tablas, who served as mayor of Orizaba, Veracruz, Mexico many times.  His maternal grandfather (Manuel Carrillo Iturriaga) was also a member of the Mexican Legislature at the turn of the 20th century.  His paternal grandfather was the illustrious Professor Don Aurelio Ortega y Placeres, considered one of the most brilliant educators of public instruction the state of Veracuz, Mexico produced.  His father was the renowned poet and educator, Professor Don Aurelio Ortega Castañeda, who baptized the city of Orizaba with the title of "Nuestra Señora de los Puentes"("Our Lady of the bridges").

Marcia Servilia Sorana: Marcia Servilia Sorana or commonly known as Servilia (40s-66) was the daughter of Roman Senator Quintus Marcius Barea Soranus and her mother may have been from the gens Servilia.  Servilia's paternal uncle was the Roman Senator Quintus Marcius Barea Sura, who was a friend to the future Roman Emperor Vespasian.  Her paternal cousins were Marcia (mother of Ulpia Marciana and of future Roman Emperor Trajan) and Marcia Furnilla (the second wife of the future Roman Emperor Titus).  Her paternal grandfather Quintus Marcius Barea Soranus was Suffect Consul in 34 and twice Proconsul of Africa.

Claudia Capitolina: Claudia Capitolina (Greek: η Κλαuδία Καπιτωλίνα ) was an Egyptian Greek woman who lived in the Roman Empire, in the 1st century and possibly in the 2nd century.  Capitolina came from a distinguished family of Equestrian rank.  She was born and raised in Alexandria, Egypt.  Capitolina was the daughter and only child of Tiberius Claudius Balbilus by his unnamed wife.  The cognomen "Capitolina", is probably from her maternal side.  Her father was one of the highest magistrates of Equestrian rank that served in Rome.  Balbilus was an astrologer and a learned scholar, who was later Prefect of Egypt.  Capitolina’s paternal grandfather, was an Egyptian Greek Grammarian and Astrologer called Thrasyllus of Mendes or Tiberius Claudius Thrasyllus, who was a friend of the Roman Emperor Tiberius, while her paternal grandmother was Greek Princess Aka II of Commagene, who was a great, granddaughter of King Antiochus I Theos of Commagene.  Her paternal cousin was Ennia Thrasylla who married the Praetorian prefect of the Praetorian Guard, Naevius Sutorius Macro.

Senhime: Senhime or Lady Sen (千姫 ) (May 26, 1597 – March 11, 1666) was the eldest daughter of the shogun Tokugawa Hidetada and his wife Oeyo.  She was born during the Warring-States period of Japanese history.  Her paternal grandfather was the founder of the Tokugawa shogunate, Tokugawa Ieyasu; her maternal grandfather was Azai Nagamasa; her grandmother was Oichi, whose brother was Oda Nobunaga.  When she was six or seven, her grandfather married her off to Toyotomi Hideyori, who was the son of Toyotomi Hideyoshi.

St. Nerses I: Nerses I the Great (Armenian: Սուրբ Ներսես Ա.  Մեծ ) was an Armenian Catholicos (or Patriarch) who lived in the fourth century.  He was the son of At'anagenes and his mother was the Arsacid Princess Bambish, a sister of King Tigranes VII (Tiran) and a daughter of King Khosrov III.  His paternal grandfather was St. Husik I whose paternal grandfather was Saint Gregory the Illuminator.

Johann Georg Hiedler: Johann Georg Hitler (baptised 28 February 1792 – 9 February 1857) was considered the officially accepted paternal grandfather of Adolf Hitler by the Third Reich.  Whether Johann Georg was in fact Hitler's biological paternal grandfather is disputed by modern historians.

David Armstrong-Jones, 2nd Earl of Snowdon: David Albert Charles Armstrong-Jones, 2nd Earl of Snowdon (born 3 November 1961), styled as Viscount Linley until 2017 and known professionally as David Linley, is an English furniture maker and the former chairman of the auction house Christie's UK.  The son of Princess Margaret, Countess of Snowdon, and of Antony Armstrong-Jones, 1st Earl of Snowdon, he is a grandson of King George VI and is 18th in line of succession to the British throne, the first in line who is not a descendant of Queen Elizabeth II.

Henry Lowther, 3rd Earl of Lonsdale: Henry Lowther, 3rd Earl of Lonsdale (27 March 1818 – 15 August 1876) was a British nobleman and Conservative politician, the eldest son of Hon Henry Cecil Lowther and Lady Lucy Sherard.  His paternal grandfather was William Lowther, 1st Earl of Lonsdale and his maternal grandfather was Philip Sherard, 5th Earl of Harborough.

Lady Margarita Armstrong-Jones: Lady Margarita Elizabeth Rose Alleyne Armstrong-Jones (born 14 May 2002) is the only daughter and youngest child of the Earl and Countess of Snowdon.  She is the only granddaughter of Princess Margaret and the first of three granddaughters of the 1st Earl of Snowdon.

Supporting paragraphs: Lady Margarita Armstrong-Jones David Armstrong-Jones, 2nd Earl of Snowdon
Answer: Antony Armstrong-Jones, 1st Earl of Snowdon