question: Who is the paternal grandfather of Edward Portman?
context: [["Abd al-Muttalib", ["Abd al- Muttalib Shaybah ibn Hashim( c. 497 \u2013 578) was the grandfather of Islamic prophet Muhammad."]], ["Henry Bryant (naturalist)", ["Henry Bryant( May 12, 1820 \u2013 February 2, 1867) was an American physician and naturalist.", "He was the grandfather of Henry Bryant Bigelow."]], ["Guillaume Wittouck", ["Guillaume Wittouck( 1749- 1829) was a Belgian lawyer and High Magistrate.", "He was the Grandfather of industrialist Paul Wittouck."]], ["Edward Portman", ["Edward Berkeley Portman (31 January 1771 \u2013 19 January 1823, Rome) of Bryanston House, Bryanston, Dorset was an 18th-century English housing developer and politician.", "He was the son of Henry Portman, and ultimately a descendant of the Tudor landowner Sir William Portman.", "Edward continued his father's work developing the family lands in London into the Portman Estate.", "He was appointed High Sheriff of Dorset for 1798-99.", "He also sat as Member of Parliament for Boroughbridge between 1802 and 1806 and for Dorset between 1806 and 1823."]], ["Fujiwara no Nagara", [", also known as Fujiwara no Nagayoshi, was a Japanese statesman, courtier and politician of the early Heian period.", "He was the grandfather of Emperor Y\u014dzei."]], ["Lyon Cohen", ["Lyon Cohen( 1868\u20131937) was a Polish- born Canadian businessman and a philanthropist.", "He was the grandfather of singer/ poet Leonard Cohen."]], ["Prithvipati Shah", ["Prithvipati Shah( ?\u20131716) was the king of the Gorkha Kingdom in the Indian subcontinent, present- day Nepal.", "He was the grandfather of Nara Bhupal Shah."]], ["Henry Portman", ["Henry William Portman was an 18th-century housing developer, the ancestor of the Viscounts Portman."]], ["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."]], ["John Westley", ["Rev. John Westley( 1636 \u2013 78) was an English nonconformist minister.", "He was the grandfather of John Wesley( founder of Methodism)."]]]
supporting_facts: [["Edward Portman", 1], ["Henry Portman", 0]]
evidences: [["Edward Berkeley Portman", "father", "Henry Portman"], ["Henry Portman", "father", "Henry William Portman"]]
answer: Henry William Portman