Question: Who is Sir Tancred Robinson, 3Rd Baronet's paternal grandfather?

Knowledge 1: Sir Tancred Robinson, 3rd Baronet
Sir Tancred Robinson, 3rd Baronet (c. 1685 – 2 September 1754) was an English Rear admiral and Lord Mayor of York.He was the second son of Sir William Robinson, 1st Baronet of Newby, Yorkshire and succeeded his elder brother Metcalfe to the baronetcy and Newby Park in 1741.His younger brother Thomas was created Baron Grantham.He joined the Royal Navy, was knighted and made commanding officer of HMS "Solebay" (1707) and "Gosport" (1708).After promotion to captain he successively commanded HMS "Deptford" (1710), "Winchester" (1712–14), "Dreadnought" (1716–18) and "Britannia" (1734–36).In 1736 he was made Rear Admiral of the Blue Squadron and in 1739 Rear Admiral of the White.He retired from the Navy in 1741.He was elected Lord Mayor of York in 1718 and again 1738.After his death in 1754, he was buried at the now demolished St Crux Church, York where inside the church was a monument to his memory.He had married Mary Norton, daughter of Rowland Norton of Dishforth, Yorkshire and had 3 sons (the eldest of whom predeceased him) and 4 daughters.He was succeeded by his eldest surviving son Sir William Robinson, 4th Baronet. [SEP] Knowledge 2: Sir William Robinson, 1st Baronet
Sir William Robinson, 1st Baronet (19 November 1655 – 22 December 1736), 1st Baronet of Newby-on-Swale, Yorkshire, was an English Whig politician who sat in the English and British House of Commons between 1689 and 1722.He was Lord Mayor of York from 1700 to 1701.Robinson was the eldest son of Thomas Robinson, Turkey merchant, of York and his wife Elizabeth, Tancred, daughter of Charles Tancred of Arden, Yorkshire.He was descended from a wealthy York merchant, also called William Robinson, who had been Lord Mayor of York and its MP during the reign of Elizabeth I. Robinson was educated at York under Mr Langley, and was admitted at St John's College, Cambridge on 6 February 1671.In 1674, he was admitted at Gray's Inn.He succeeded his father in 1676.He married Mary Aislabie, daughter of George Aislabie of Studley Royal, Yorkshire on 8 September 1679.He was a Captain of the Yorkshire horse militia from December 1688 and was associated with Danby’s rising during the Glorious Revolution.Robinson was returned as Member of Parliament for Northallerton on his own interest at the 1689 English general election.He was not very active in parliament and was appointed to only three committees.He was High Sheriff of Yorkshire in from March to November 1689.His uncle Metcalfe Robinson had been created a baronet in 1660, but died without issue in 1689, so that the baronetcy became extinct.Robinson was created a baronet to revive the title on 13 February 1690.Robinson was returned as MP for Northallerton at the 1690 English general election.He was MP for York from 1698 until 1722.He was also Lord Mayor of York in 1700.He commissioned Colen Campbell to build Newby Park house (later known as Baldersby Park House) in the new Palladian style at Newby-on-Swale.It was completed in 1721 and is now a Grade I listed building.Robinson died on 22 December 1736 and was buried at Topcliffe.He had five sons and one daughter.His eldest son, Metcalfe, survived him by only four days, the baronetcy then passed to his second son, Tancred, who became a Rear Admiral of the White and was twice Lord Mayor of York.His fourth son, Thomas served as Secretary of State for the Southern Department and Leader of the House of Commons, and was raised to the peerage as Baron Grantham in 1761.
Knowledge 1: Sir Tancred Robinson, 3rd Baronet
Sir Tancred Robinson, 3rd Baronet (c. 1685 – 2 September 1754) was an English Rear admiral and Lord Mayor of York.He was the second son of Sir William Robinson, 1st Baronet of Newby, Yorkshire and succeeded his elder brother Metcalfe to the baronetcy and Newby Park in 1741.His younger brother Thomas was created Baron Grantham.He joined the Royal Navy, was knighted and made commanding officer of HMS "Solebay" (1707) and "Gosport" (1708).After promotion to captain he successively commanded HMS "Deptford" (1710), "Winchester" (1712–14), "Dreadnought" (1716–18) and "Britannia" (1734–36).In 1736 he was made Rear Admiral of the Blue Squadron and in 1739 Rear Admiral of the White.He retired from the Navy in 1741.He was elected Lord Mayor of York in 1718 and again 1738.After his death in 1754, he was buried at the now demolished St Crux Church, York where inside the church was a monument to his memory.He had married Mary Norton, daughter of Rowland Norton of Dishforth, Yorkshire and had 3 sons (the eldest of whom predeceased him) and 4 daughters.He was succeeded by his eldest surviving son Sir William Robinson, 4th Baronet. [SEP] Knowledge 2: Lyon Cohen
Lyon Cohen( 1868–1937) was a Polish- born Canadian businessman and a philanthropist.He was the grandfather of singer/ poet Leonard Cohen.
Knowledge 1: Sir Tancred Robinson, 3rd Baronet
Sir Tancred Robinson, 3rd Baronet (c. 1685 – 2 September 1754) was an English Rear admiral and Lord Mayor of York.He was the second son of Sir William Robinson, 1st Baronet of Newby, Yorkshire and succeeded his elder brother Metcalfe to the baronetcy and Newby Park in 1741.His younger brother Thomas was created Baron Grantham.He joined the Royal Navy, was knighted and made commanding officer of HMS "Solebay" (1707) and "Gosport" (1708).After promotion to captain he successively commanded HMS "Deptford" (1710), "Winchester" (1712–14), "Dreadnought" (1716–18) and "Britannia" (1734–36).In 1736 he was made Rear Admiral of the Blue Squadron and in 1739 Rear Admiral of the White.He retired from the Navy in 1741.He was elected Lord Mayor of York in 1718 and again 1738.After his death in 1754, he was buried at the now demolished St Crux Church, York where inside the church was a monument to his memory.He had married Mary Norton, daughter of Rowland Norton of Dishforth, Yorkshire and had 3 sons (the eldest of whom predeceased him) and 4 daughters.He was succeeded by his eldest surviving son Sir William Robinson, 4th Baronet. [SEP] Knowledge 2: Tancred Robinson
Sir Tancred Robinson( c. 1658 – 29 March 1748) was an English physician, known also as a naturalist.

Answer: Thomas Robinson