question: Who is the maternal grandfather of Helvig Of Schauenburg?
context: [["John Westley", ["Rev. John Westley( 1636 \u2013 78) was an English nonconformist minister.", "He was the grandfather of John Wesley( founder of Methodism)."]], ["Anton of Schauenburg", ["Anton of Schauenburg( d. 1558) was Archbishop- Elector of Cologne from 1557 to 1558."]], ["Helvig of Schauenburg", ["Helvig of Schauenburg  (1398\u20131436), also known as Hedvig of Holstein and also Hedwig of Schauenburg, was a duchess of Schleswig and a countess of Holstein from the family of Schauenburg, and ancestor of the Danish Royal houses of Oldenburg and Schleswig-Holstein-Sonderburg-Gl\u00fccksburg.", "She was a daughter of Gerhard VI of Holstein-Rendsburg and his wife, Catherine Elisabeth of Brunswick-L\u00fcneburg.", "Her brother was Adolf VIII/", "I, Count of Holstein/Duke of Schleswig.", "Through their father, they were cognatic descendants of King Eric V of Denmark while through their mother, they were cognatic descendants of King Abel of Denmark.", "On 18 April 1417 Helvig was married to Prince Balthasar of Mecklenburg, who died of the plague in 1421.", "In 1423 she was married to Dietrich, Count of Oldenburg.", "From her second marriage she had the following children:"]], ["Abd al-Muttalib", ["Abd al- Muttalib Shaybah ibn Hashim( c. 497 \u2013 578) was the grandfather of Islamic prophet Muhammad."]], ["Catherine Elisabeth of Brunswick-L\u00fcneburg", ["Catherine Elisabeth of Brunswick-L\u00fcneburg (ca 1367 \u2013 after 1423) was Duchess consort of Schleswig and Countess consort of Holstein-Rendsburg.", "She was the regent of some of the fiefs of her son Henry during his minority from 1404 to 1415.", "She was a daughter of Magnus II, Duke of Brunswick-L\u00fcneburg and Catherine of Anhalt-Bernburg, daughter of Bernhard III, Prince of Anhalt-Bernburg.", "Through her mother, she was the great-great granddaughter of King Abel of Denmark.", "She would also become the grandmother of Christian I of Denmark.", "Catherine Elisabeth was in fact likely named only Catherine; she was often referred to as Elisabeth in older literature, but this was likely due to a mixup with her younger sister, who was named Elisabeth.", "In the 14th century, it was still rare to have two first names such as \"Catherine Elisabeth\".", "Due to this confusion, however, she has sometimes been referred to by both names."]], ["Adolf IV of Holstein", ["Adolf IV( before 1205 \u2013 8 July 1261), was a Count of Schauenburg( 1225 \u20131238) and of Holstein( 1227 \u2013 1238), of the House of Schaumburg.", "Adolf was the eldest son of Adolf III of Schauenburg and Holstein by his second wife, Adelheid of Querfurt."]], ["Lyon Cohen", ["Lyon Cohen( 1868\u20131937) was a Polish- born Canadian businessman and a philanthropist.", "He was the grandfather of singer/ poet Leonard Cohen."]], ["Adolf III of Schauenburg", ["Adolf III of Schauenburg( 1511\u20131556) was the Archbishop- Elector of Cologne from 1547 to 1556."]], ["Kaya Alp", ["Kaya Alp was, according to Ottoman tradition, the son of K\u0131z\u0131l Bu\u011fa and the father of Suleyman Shah, who was, in turn, the grandfather of Ertu\u011frul, and the great grandfather of the Ottoman Empire founder, Osman I."]], ["Adolf III of Holstein", ["Adolf III, Count of Schauenburg and Holstein( 1160 \u2013 3 January 1225) was the ruler of the Counties of Schauenburg and Holstein.", "He is particularly remembered for his establishment of a new settlement for traders on the banks of the Alster near the\" Neue Burg\" in Hamburg."]]]
supporting_facts: [["Helvig of Schauenburg", 1], ["Catherine Elisabeth of Brunswick-L\u00fcneburg", 2]]
evidences: [["Helvig of Schauenburg", "mother", "Catherine Elisabeth of Brunswick-L\u00fcneburg"], ["Catherine Elisabeth of Brunswick-L\u00fcneburg", "father", "Magnus II, Duke of Brunswick-L\u00fcneburg"]]
answer: Magnus II, Duke of Brunswick-Lüneburg