Question: Who is George Rice, 3Rd Baron Dynevor's maternal grandfather?

Knowledge 1: George Rice, 3rd Baron Dynevor
George Talbot Rice, 3rd Baron Dynevor (Dinefwr) (8 October 1765 – 9 April 1852) was a British peer and politician.He was the son of Cecil de Cardonnel, 2nd Baroness Dynevor and George Rice (or Rhys).He was educated at Westminster School and matriculated at Christ Church, Oxford on 1 February 1783, where he was awarded a Master of Arts degree on 30 May 1786.Talbot Rice was the Tory Member of Parliament for Carmarthenshire from 1790 to 1793.His father had previously been the Tory MP for Carmarthenshire between 1754-1779.He inherited his title in 1793 on the death of his mother.The 3rd Baron's mother had adopted, by royal licencethe name of de Cardonnel.In 1817 (again by royal licence) he resumed his paternal surname of Rice.His name is now often hyphenated as Talbot-Rice.He died on 9 April 1852.On 20 October 1794 he had married Frances Townshend, third daughter of Thomas Townshend, 1st Viscount Sydney of St Leonards.They had 2 sons and 5 daughters and lived at Newton House in his Dynefwr estate near Llandeilo, Carmarthenshire.He was succeeded by his eldest son George, who later adopted the surname of Rice-Trevor. [SEP] Knowledge 2: Cecil de Cardonnel, 2nd Baroness Dynevor
Cecil de Cardonnel, 2nd Baroness Dynevor (July 1735 – 14 March 1793) was a Welsh peeress.She was the daughter of William Talbot, 1st Earl Talbot.Her mother was the daughter and heir of Adam de Cardonnel, British Secretary of War.Under the special remainder in the creation of the barony for her father, she and her heirs male were entitled to inherit the Barony of Dynevor.He father was also the 1st Earl Talbot (a title that became extinct on his death) and 2nd Baron Talbot of Hensol.That title was inherited by Lady Dynevor’s cousin, John Chetwynd-Talbot.On 16 August 1756 she married George Rice.Rice was a Member of Parliament for county Carmarthenshire between 1754 and 1779 and Lord Lieutenant of Carmarthen from 1755 to 1779.Rice died on 3 August 1779.The widowed Lady Dinevor, took, by royal licence, the surname of de Cardonnel from 21 May 1787.She succeeded to the title in 1782, upon the death of her father.She died on 14 March 1793, at Dynevor Castle, aged 57.The title passed to her elder son, George Talbot-Rice who become the 3rd Baron Dynevor, resuming his paternal surname of Rice in 1827.
Knowledge 1: George Rice, 3rd Baron Dynevor
George Talbot Rice, 3rd Baron Dynevor (Dinefwr) (8 October 1765 – 9 April 1852) was a British peer and politician.He was the son of Cecil de Cardonnel, 2nd Baroness Dynevor and George Rice (or Rhys).He was educated at Westminster School and matriculated at Christ Church, Oxford on 1 February 1783, where he was awarded a Master of Arts degree on 30 May 1786.Talbot Rice was the Tory Member of Parliament for Carmarthenshire from 1790 to 1793.His father had previously been the Tory MP for Carmarthenshire between 1754-1779.He inherited his title in 1793 on the death of his mother.The 3rd Baron's mother had adopted, by royal licencethe name of de Cardonnel.In 1817 (again by royal licence) he resumed his paternal surname of Rice.His name is now often hyphenated as Talbot-Rice.He died on 9 April 1852.On 20 October 1794 he had married Frances Townshend, third daughter of Thomas Townshend, 1st Viscount Sydney of St Leonards.They had 2 sons and 5 daughters and lived at Newton House in his Dynefwr estate near Llandeilo, Carmarthenshire.He was succeeded by his eldest son George, who later adopted the surname of Rice-Trevor. [SEP] Knowledge 2: George Rice-Trevor, 4th Baron Dynevor
George Rice-Trevor, 4th Baron Dynevor (5 August 1795 – 7 October 1869) was a British politician and peer.
Knowledge 1: George Rice, 3rd Baron Dynevor
George Talbot Rice, 3rd Baron Dynevor (Dinefwr) (8 October 1765 – 9 April 1852) was a British peer and politician.He was the son of Cecil de Cardonnel, 2nd Baroness Dynevor and George Rice (or Rhys).He was educated at Westminster School and matriculated at Christ Church, Oxford on 1 February 1783, where he was awarded a Master of Arts degree on 30 May 1786.Talbot Rice was the Tory Member of Parliament for Carmarthenshire from 1790 to 1793.His father had previously been the Tory MP for Carmarthenshire between 1754-1779.He inherited his title in 1793 on the death of his mother.The 3rd Baron's mother had adopted, by royal licencethe name of de Cardonnel.In 1817 (again by royal licence) he resumed his paternal surname of Rice.His name is now often hyphenated as Talbot-Rice.He died on 9 April 1852.On 20 October 1794 he had married Frances Townshend, third daughter of Thomas Townshend, 1st Viscount Sydney of St Leonards.They had 2 sons and 5 daughters and lived at Newton House in his Dynefwr estate near Llandeilo, Carmarthenshire.He was succeeded by his eldest son George, who later adopted the surname of Rice-Trevor. [SEP] Knowledge 2: Thomas Spring Rice, 3rd Baron Monteagle of Brandon
Thomas Aubrey Spring Rice, 3rd Baron Monteagle of Brandon (3 November 1883 – 11 October 1934) was an Anglo-Irish peer and British diplomat.

Answer: William Talbot, 1st Earl Talbot