Title: Margaret of Sicily
Content:  Margaret of Sicily (also called Margaret of Hohenstaufen or Margaret of Germany) (1 December 1241, in Foggia – 8 August 1270, in Frankfurt-am-Main) was a Princess of Sicily and Germany, and a member of the House of Hohenstaufen. By marriage she was Landgravine of Thuringia and Countess Palatine of Saxony (German: Landgräfin von Thüringen und Pfalzgräfin von Sachsen). She was the daughter of Frederick II, Holy Roman Emperor, King of Sicily and Germany, by his third wife, Isabella of England. Her paternal grandparents were Henry VI, Holy Roman Emperor and Constance of Sicily. Her maternal grandparents were John of England and Isabella of Angoulême.
Title: Margaret of Sicily
Content:  The date of her birth is difficult to ascertain because there is controversy over the exact number of children borne by her mother. Some sources say that she was the first or second child, born by the end of 1237; others  say that she was the last child, born in December 1241, when Isabella died in childbirth. Historians commonly accept the latter date.
Title: Margaret of Burgundy, Queen of Sicily
Content:   Margaret of Burgundy (Marguerite de Bourgogne) (1250 – 4 September 1308) was Queen of Sicily and Naples by marriage to Charles I of Sicily. She was also a ruling Countess of Tonnerre from 1262 until 1308.
Title: Margaret of Sicily, Countess Palatine of the Rhine
Content:  Margaret of Sicily or Margherita di Sicilia-Aragona (1331 in Palermo – 1377 in Neustadt) was a Sicilian princess, daughter of the King Frederick III of Sicily and his wife Eleanor of Anjou. In 1348 she married Rudolf II, Count Palatine of the Rhine, and was Countess Palatine of the Rhine until 1353, year of the husband's death.
Title: Margaret of Burgundy, Queen of Sicily
Content:  She became Queen consort of Sicily by her marriage to Charles of Anjou, King of Sicily and Count of Anjou and Provence, on 18 November 1268. Their only daughter, Margaret, died in infancy. She also became titular Queen consort of Jerusalem, after Charles bought the title from Mary of Antioch in 1277. She and her husband lost the title of King and Queen of Sicily in 1283, becoming King and Queen of Naples only.
Title: Margaret of Sicily
Content:  After the execution of her nephew Conradin (29 October 1268), Margaret, as the next legitimate relative, became the rightful Queen of Sicily and the general heiress of the Hohenstaufen claims over the Duchy of Swabia and the Kingdom of Jerusalem (despite the fact she was not descended from the Kings of Jerusalem, her father Frederick II had claimed the kingdom for himself). Her son Frederick assumed by some time this titles on her right. After discovering the adultery of her husband with Kunigunde of Eisenberg, Margaret left Wartburg; according to a legend, before her departure she bit her son Frederick in the cheek; he was called henceforth Frederick the Bitten (de: Friedrich der Gebissene). The flight took place on 24 June 1270. Margaret went to Frankfurt-am-Main and was supported there by the citizens. She died there six weeks later.
Title: Margaret of Sicily
Content:  Shortly after her birth (1242), Margaret was betrothed to Albert "the Degenerate", eldest son and heir of Henry III "the Illustrious", Margrave of Meissen. The marriage took place in June 1255, the bride receiving Pleissnerland (the towns of Altenburg, Zwickau, Chemnitz and Leisnig) as her dowry. The couple settled at his residence in Eckartsberga and later moved to Wartburg, where she bore five children: three sons (Henry, Frederick and Dietzmann) and two daughters (Margaret and Agnes). Through her second son Frederick – later Margrave of Meissen – Margaret was the direct ancestor of the Electors and Kings of Saxony and English Queen consorts Margaret of Anjou and Anne of Cleves. In 1265 her husband received the titles of Landgrave of Thuringia and Count Palatine of Saxony (Pfalzgräf von Sachsen) after the abdication of his father, who retained control of 
Title: Margaret of Navarre
Content:  Margaret was the daughter of King García Ramírez of Navarre and Marguerite de l'Aigle. She was married at a young age to William I of Sicily, in 1149, the fourth son of Roger II of Sicily. According to the Palermitan archivist Isidoro La Lumia, she was, in her later years, bella ancora, superba, leggiera ("still beautiful, proud, light"). During the reign of her husband, Margaret was largely ignored by William who spent much of his time away from court--often frequenting his many personal harems. However, she is considered to have been a stronger, more apt administrator than her husband, and several times convinced him to act where he was determined to be passive. She worked closely with Maio of Bari, the king's ammiratus ammiratorum, and they were often allied in trying to subvert opponents of the monarchy, though she was once detained with two of three sons by Matthew Bonnellus during a revolt, during which her eldest son was killed in a mass.
Title: Margaret of Navarre
Content:  Margaret of Navarre (Marguerite, Margarita, Margherita) (c. 1135 – 12 August 1183) was the queen consort of the Kingdom of Sicily during the reign of William I (1154–1166) and the regent during the minority of her son, William II.
Title: Margaret of Sicily, Countess Palatine of the Rhine
Content:  Margaret was the youngest daughter of King Frederick II of Sicily-Aragon (1272-1337) and his wife Eleanore, daughter of Charles II of Anjou. Her parents resided in Palermo, where she presumably was born. In 1348 Margaret married the widowed Count Palatine Rudolf II from the house of Wittelsbach, who lived in Neustadt an der Weinstraße. In 1349 Rudolf II married his daughter from his first marriage, Anna von der Pfalz, to King Charles IV, one of the most important rulers of the late Middle Ages. Anna died in Prague in 1353. Count Rudolf finally retired because of increasing illness, and handed the government business over to his brother and successor Ruprecht, who in 1356 was able to acquire the Electorate for the Palatinate. Rudolf II was nicknamed the blind, because he had a serious eye disease and was blind in his last year of life. The marriage of Rudolf II and Margaret of Sicily-Aragon remained childless. Elizabeth of Portugal (1271-1336), Margaret's father's sister, is revered as a saint. Her mother's brother, Louis of Toulouse, is also one of the saints of the Catholic Church.

Question: Who is the mother of Margaret of Sicily?
Answer: Isabella of England.
ISABELLA d'Inghilterra, regina di Sicilia, imperatrice.