Question: Princess Astrid, Mrs. Ferner is the older sister of a king who ascended to the throne on which day ?

Context paragraphs:
Ramesuan (king of Ayutthaya): Somdet Phra Ramesuan (Thai: สมเด็จพระราเมศวร ) (1339–1395), son of king Ramathibodi I, reigned as the second and fifth king of the kingdom of Ayutthaya.  When King Ramathibodi ascended to the throne of Ayuthaya, he sent King Ramesuan to reign in Lavo.  Upon King Ramathibodi's death in 1369, King Ramesuan traveled to Ayutthaya to assume the throne, but held it for less than a year before being deposed by his uncle, King Borommaracha I, the ruler of Suphanburi.  Sources differ over the nature of their conflict; official chronicles state that the older Boromaracha ruled with the willing consent of his nephew, while Jeremias van Vliet's "Short History of Thailand" indicated that Boromaracha's ascension came only after a bloody conflict bordering on civil war.

Princess Astrid, Mrs. Ferner: Princess Astrid, Mrs. Ferner (Astrid Maud Ingeborg; born 12 February 1932 in Oslo, Norway) is the second daughter of King Olav V of Norway and his wife, Princess Märtha of Sweden.  She is the older sister of King Harald V of Norway and younger sister of the late Princess Ragnhild.

Sen Soulintha: Sen Soulintha, Saen Surintha or Sen Sourintha (1511–1582) was born Chane Tian and became King of Lan Xang reigning 1571-1575 and again 1580-1582.  Sen Soulintha was not of noble birth, rising from royal page to King Setthatirath’s Chief Minister.  During the succession disputes in the Kingdom of Lan Na between King Setthatirath and King Mekuti, Sen Soulintha served Setthatirath as a general and successfully took several cities of Lan Na including Chiang Saen for which he was given the honorific name "Lusai" meaning “victory.”  Sen Soulintha supported Setthatirath in leading the guerrilla campaigns during the Burmese invasions of King Bayinnaung.  When Setthatirath died near Attapeu under suspicious circumstances in 1572, Sen Soulintha led the armies of Lan Xang back to Vientiane.  A succession dispute erupted, which nearly led to civil war and provided a pretext for another Burmese invasion ordered by Bayinnaung and led by the Chief Minister Binnya Dala.  Sen Soulintha defeated the Burmese and Lan Na forces led by Binnya Dala, an event which led to the latter’s exile, only to face a more massive invasion led by Bayinnaug the following year.  Sen Soulintha again attempted to resort to guerilla tactics, but lacked popular support from his seizure of the throne.  He and his son Ong Lo (Nakhon Noi) were captured by Bayinnaung and exiled to Pegu.  The Burmese placed Setthathirath’s brother, and former "Ouphahat" or Viceroy, Prince Tha Heua on the throne.  According to the Luang Prabang chronicles it was this brother, who had led a rebellion in Luang Prabang and tried to seize the throne from Setthathirath on the death of their father Photisarath.  Prince Tha Heua took the regnal name Voravongsa and reigned under Burmese suzerainty from 1575-1579.  Voravongsa was never popular, and drowned with his family while attempting to flee Vientiane in the face of popular uprising.  In 1579, Bayinnaung dispatched a sizable army to restore order.  According to Lao histories Sen Soulintha was then installed as king a second time in 1580.  By that time Sen Soulintha was an old man and reigned only for two years before his son ascended the throne as Nakhon Noi and another succession dispute ensued.

Johan Ferner: Johan Martin Ferner (né "Johan Martin Jacobsen"; 22 July 192724 January 2015) was a Norwegian sailor and Olympic medalist.  He won a silver medal in the 6 metre class with the boat "Elisabeth X" at the 1952 Summer Olympics in Helsinki, together with Finn Ferner (his brother), Erik Heiberg, Tor Arneberg and Carl Mortensen.  He was married to Princess Astrid, the sister of King Harald V of Norway.  He was also the brother-in-law of Princess Ragnhild.

Princess Benedikte of Denmark: Princess Benedikte of Denmark, Princess of Sayn-Wittgenstein-Berleburg {'1': ", '2': ", '3': 'RE, SKmd, D.Ht. ', '4': "} (Benedikte Astrid Ingeborg Ingrid, born 29 April 1944) is the second daughter of King Frederick IX of Denmark and Ingrid of Sweden.  She is the younger sister of the reigning Queen of Denmark, Margrethe II, and the older sister of Queen Anne-Marie of Greece.

Harald V of Norway: Harald V (] ; born 21 February 1937) is the King of Norway, having ascended the throne following the death of his father on 17 January 1991.

Princess Astrid Coast: Princess Astrid Coast is that portion of the coast of Queen Maud Land lying between 5° and 20° E.  The entire coast is bordered by ice shelves.  Discovered by Capt. H. Halvorsen of the Sevilla (ship) in March 1931 and in 1932 named for Princess Astrid of Norway.

Princess Ragnhild, Mrs. Lorentzen: Princess Ragnhild, Mrs. Lorentzen (Ragnhild Alexandra; 9 June 1930 – 16 September 2012) was the eldest child of King Olav V of Norway and Princess Märtha of Sweden.  She was the older sister of King Harald V and Princess Astrid.

Parakrama Pandyan I: Parakrama Pandyan I was a Pandyan king of Tamilakkam, ruling from the Pandyan capital in Madurai.  He was besieged in a Pandyan war by his contemporary, rival and throne claimant Kulasekhara Pandyan in 1169, a vassal of the Chola Dynasty.  Parakrama Pandyan I sought assistance from the Ceylonese king Parakramabahu I of Polonnaruwa but was subsequently executed.  Kulasekhara Pandyan ascended to the Madurai throne but was eventually forced to seek refuge in Chola country in 1171.  Parakrama Pandyan I's son Vira Pandyan III ascended on the Pandyan throne before he was defeated by Chola forces.  In 1212 CE a succeeding namesake royal of the dynasty, Parakrama Pandyan II invaded Ceylon and became monarch at Polonnaruwa for three years with the title Parakrama Pandya of Polonnaruwa.

Dhamma Dewi of Toungoo: Dhamma Dewi (Burmese: ဓမ္မဒေဝီ , ] ) was one of three principal queens of King Tabinshwehti of Toungoo Dynasty and the elder sister of King Bayinnaung.  She was born Khin Hpone Soe (ခင်ဘုန်းစိုး , ] ), a commoner daughter of royal servants of Prince Tabinshwehti.  In November 1530, the prince ascended to the throne as king, and raised her as one of his two principal queens.  The queen, who was at least a year older than the king, is said to have been the king's favorite until 1545 when the king raised Khay Ma Naw as his co-chief queen.

Supporting paragraphs: Princess Astrid, Mrs. Ferner Harald V of Norway
Answer: on 17 January 1991