Alexandra, Countess of Frederiksborg
Alexandra, Countess of Frederiksborg,(" née" Alexandra Christina Manley; born 30 June 1964) is the first wife of Prince Joachim of Denmark, the younger son of Margrethe II of Denmark.
She was born in Hong Kong and is of mixed Chinese- European ancestry.
She was introduced to Prince Joachim in 1994.
They married in 1995 and had two sons together, until the marriage was dissolved in 2005.
Ingrid of Sweden
Ingrid of Sweden
(Ingrid Victoria Sofia Louise Margareta; 28 March 1910 – 7 November 2000) was Queen of Denmark from 1947 until 1972 as the wife of King Frederick IX.
Born into the House of Bernadotte, she was the daughter of King Gustaf VI Adolf of Sweden and his first wife, Princess Margaret of Connaught.
In 1935 she married Crown Prince Frederick of Denmark and they had three daughters, Margrethe, the present Queen of Denmark, Benedikte, now a Princess of Sayn-Wittgenstein-Berleburg, and Anne-Marie, the former Greek queen.
In 1947, her husband became king on his father's death.
As queen, Ingrid reformed the traditions of Danish court life, abolished many old-fashioned customs at court and created a more relaxed atmosphere at official receptions.
King Frederick IX died in 1972, and Ingrid's daughter Margrethe became queen.
She was also a paternal aunt of the present Swedish monarch, King Carl XVI Gustaf.
Maurice, Count of Oldenburg
Maurice I( c. 1145 – c. 1211) was Count of Oldenburg from 1169 through 1211.
Count Maurice of Oldenburg was the son of Count Christian I of Oldenburg and his wife Kunigunde.
He married Salome, the daughter of Otto II, Count of Wickrath.
He is the male- line progenitor of Margrethe II of Denmark, Harald V of Norway, Constantine II of Greece, Charles, Prince of Wales, and Prince William, Duke of Cambridge.
Princess Margaretha, Mrs. Ambler
Princess Margaretha, Mrs. Ambler,( Margaretha Désirée Victoria; born 31 October 1934) is a Swedish princess, the eldest sister of King Carl XVI Gustaf of Sweden and also first cousin of Queen Margrethe II of Denmark.
Kaya Alp
Kaya Alp was, according to Ottoman tradition, the son of Kızıl Buğa and the father of Suleyman Shah, who was, in turn, the grandfather of Ertuğrul, and the great grandfather of the Ottoman Empire founder, Osman I.
Queen Anne-Marie of Greece
Queen Anne- Marie of Greece, RE( born Princess Anne- Marie of Denmark on 30 August 1946) is the wife of King Constantine II, who reigned from 1964 until 1973.
Anne- Marie is the youngest daughter of King Frederick IX of Denmark and his wife Ingrid of Sweden.
She is the youngest sister of the reigning Queen Margrethe II of Denmark and cousin of the reigning King Carl XVI Gustaf of Sweden.
Princess Caroline-Mathilde of Denmark
Princess Caroline- Mathilde of Denmark( 27 April 1912 – 12 December 1995) was a daughter of Prince Harald of Denmark and granddaughter of King Frederick VIII of Denmark.
As the wife of Knud, Hereditary Prince of Denmark, she became Hereditary Princess of Denmark.
Eric IV of Denmark
Eric IV, also known as Eric Ploughpenny or Eric Plowpenny,( – 10 August 1250) was king of Denmark from 1241 until his death in 1250.
He was the son of Valdemar II of Denmark by his wife, Berengaria of Portugal, and brother of King Abel of Denmark and King Christopher I of Denmark
Frederik, Crown Prince of Denmark
Frederik, Crown Prince of Denmark, Count of Monpezat,( Frederik André Henrik Christian; born 26 May 1968) is the heir apparent to the throne of Denmark.
Frederik is the elder son of Queen Margrethe II and the late Henrik, Prince Consort.
Margrethe II of Denmark
Margrethe II (full name: "Margrethe Alexandrine Þórhildur Ingrid"; born 16 April 1940) is Queen of Denmark, as well as the supreme authority of the Church of Denmark and commander-in-chief of the Danish Defence.
Born into the House of Glücksburg, a royal house with origins in northern Germany, she was the eldest child of Frederick IX of Denmark and Ingrid of Sweden.
She became heir presumptive to her father in 1953, when a constitutional amendment allowed women to inherit the throne.
Margrethe succeeded her father upon his death on 14 January 1972.
On her accession, she became the first female monarch of Denmark since Margrethe I, ruler of the Scandinavian kingdoms in 1375–1412 during the Kalmar Union.
In 1967, she married Henri de Laborde de Monpezat, with whom she has two sons: Crown Prince Frederik and Prince Joachim.
She has been on the Danish throne for years, becoming the second-longest-reigning Danish monarch after her ancestor Christian IV.

Question: Who is the maternal grandfather of Margrethe Ii Of Denmark?
Answer: Gustaf VI Adolf of Sweden