Question: Ben Miles portrays a character in "The Crown" who had a romance with which member of the royal family?

Context paragraphs:
Royal Family Order of King Harald V of Norway: The Royal Family Order of King Harald V of Norway is a Royal Family Order bestowed by the King of Norway upon female members of the Norwegian Royal Family.  Unlike the other two Royal family orders, it is currently awarded.

Order of Saints George and Constantine: The Royal Family Order of Saints George and Constantine (Greek: Βασιλικό Οικογενειακό Τάγμα των Αγίων Γεωργίου και Κωνσταντίνου ) is an order of the Greek royal family.  For the duration of its existence, it has been the second highest decoration awarded by the modern Greek state and the Greek crown, after the Order of the Redeemer.  It was instituted in January 1936 by King George II in the memory of his grandfather (King George I) and his father (King Constantine I).  The order is awarded only to men, while the corresponding Order of Saints Olga and Sophia is reserved for women.  The order's design was influenced by the royal family's Danish origin, evoking the appearance of the Order of the Dannebrog.  The order is not awarded since 1975 by the Greek state after the abolition of monarchy and today is awarded only by the Greek Royal Family.

Royal Family Order of King George IV: The Royal Family Order of King George IV was an honour bestowed as a mark of personal esteem on female members of the British Royal Family by King George IV.  It was the first Royal Family Order issued in the United Kingdom.  Prior to George IV's accession in 1820, both ladies and gentlemen of the Court, as well as female members of the royal family, had worn the Sovereign's portrait set in a jewelled frame.  George IV formalised the order.

Peter Townsend (RAF officer): Group Captain Peter Wooldridge Townsend, (22 November 1914 – 19 June 1995) was a Royal Air Force officer, flying ace, courtier and author.  He was Equerry to King George VI from 1944 to 1952 and held the same position for Queen Elizabeth II from 1952 to 1953.  Townsend also had a romance with Princess Margaret.

Royal eponyms in Canada: In Canada, a number of sites and structures are named for royal individuals, whether a member of the past French Royal Family, British Royal Family, or present Canadian Royal Family thus reflecting the country's status as a constitutional monarchy under the Canadian Crown.  Those who married into the royal family are indicated by an asterisk.

Royal monuments in Canada: In Canada, a number of monuments have been erected to honour royal individuals, whether a member of the past French Royal Family, British Royal Family, or present Canadian Royal Family, thus reflecting the country's status as a constitutional monarchy under the Canadian Crown.

Ben Miles: Benjamin Charles Miles (born 1 November 1966) is an English actor, best known for his starring role as Patrick Maitland in the British TV comedy "Coupling", from 2000 to 2004 and as Peter Townsend in the Netflix drama "The Crown" (2017).

Royal family order: A royal family order is a decoration conferred by the sovereign of a royal family in a monarchy to female members of the royal family, since female members of the royal family traditionally do not wear the commemorative medals that men wear.  Such an order is considered more of a personal memento than a state decoration, although it may be worn during official state occasions.  The only way to know whom the order has been bestowed is to see the recipient wearing it.

List of British royal residences: This is a list of residences occupied by the British royal family, noting the seasons of the year they are traditionally occupied.  Members of the Royal Family inhabit their range of residences across the United Kingdom.  Some are royal palaces, owned by the Crown and held in trust by the monarch; others are privately owned.  Balmoral Castle and Sandringham House have been inherited as private property for several generations.  Other royal palaces are no longer residences (e.g. the Palace of Westminster, the Palace of Whitehall).  Some remain in irregular use for royal occasions (such as Hillsborough Castle).  The Royal Palaces enjoy certain legal privileges: for example, there is an exemption from levying duty on alcoholic beverages sold in the bars at the Palace of Westminster and there are exemptions from Health and Safety legislation.  According to "Halsbury's Laws of England", it is not possible to arrest a person within the "verges" of a royal palace (though this assertion is contradicted by a memorandum by the Clerk of the House of Commons in respect of the Palace of Westminster), and when a royal palace is used as a residence (regardless of whether the monarch is actually living there at the time), judicial processes cannot be executed within that palace.

Order of Prince Danilo I: The Order of Prince Danilo I of Montenegro (Montenegrin: Орден Књаза Данила I, Orden Knjaza Danila I) was an order of the Principality, and later Kingdom, of Montenegro.  It is currently granted as a dynastic honor by the undisputed head of the House of Petrović-Njegoš, Nicholas Petrović Njegoš II.  Although no longer a state order, recognition is indicated by the acceptance of the former President of Montenegro, Filip Vujanović.  More formal recognition by the Republic of Montenegro is implicit in the 2011 "Law on the Status of the Descendants of the Petrović Njegoš Dynasty", which recognizes the current crown prince as head of the Royal Family and specifically sanctions the use of the royal family's heraldic symbols.  The act also provides the Crown Prince housing and a pension and has been noted as conferring a sort of "quasi restoration" of the throne.  In a May 15th "Pobjeda" newspaper interview, Prince Nikola cited Article 3 of this law as the basis for his May 5th re-institution of the Order, which he emphasized was "historically an extremely valuable Montenegrin decoration."  He went on to explain that the order can be awarded to Montenegrin nationals and worthy foreigners on two general grounds: (1), for support and affirmation of Montenegrin independence and the royal tradition of the Petrovic Njegos dynasty, and (2) to those whose "scientific or social work contributed to the development of culture, art and science."  The Order has since been bestowed on a number of high dignitaries internationally.  In an April 17, 2016 visit to Rome, HRH Prince Nikola II Petrovic Njegoš met with Pope Francis and other high Vatican officials bestowing the dynastic honor on the Cambodian ambassador, His Highness Prince Sisowath Ravivaddhana Monipong, the Montenegrin ambassador to the Holy See Veselin Šuković, as well as the U.S. Ambassador to the Holy See Kenneth Francis Hackett, and the ambassador of Hungary HIRH Eduard von Habsburg-Lothringen, among several other Vatican officials and Italian nobles.  The official Representative of the Royal House and the order is H.E. Giuseppe Tedischi GCDO, who also has the Vatican charge "Addetto di Anticamera di Sua Santità," or Officer of Antechamber of His Holiness.

Supporting paragraphs: Ben Miles Peter Townsend (RAF officer)
Answer: Princess Margaret