Question: Who is the paternal grandfather of Leicester Devereux, 7Th Viscount Hereford?

Knowledge 1: Leicester Devereux, 7th Viscount Hereford
Leicester Devereux, 7th Viscount Hereford (1674–1683) was a British Peer.He was the eldest son of Leicester Devereux, 6th Viscount Hereford (1617–1676) and succeeded to the title as an infant.He died young and was succeeded by his younger brother Edward.Edward died at the age of 25 in 1700 and the viscountcy passed to a Welsh cousin Price Devereux of Vaynor Park, Montgomeryshire.Edward's sister Anne outlived her brothers, becoming the heiress: she married Leicester Martin. [SEP] Knowledge 2: Leicester Devereux, 6th Viscount Hereford
Leicester Devereux, 6th Viscount Hereford (1617 – 1 December 1676) was a British Peer.He was the second son of Walter Devereux, 5th Viscount Hereford (1578–1658).He married Elizabeth Withipoll, daughter and sole heiress of Sir William Withipoll who inherited Christchurch Mansion, Ipswich.His second wife was Priscilla Catchpole.His daughter Frances married William Tracy, 4th Viscount Tracy (1657–1712).He was succeeded by his sons
Leicester and Edward.His daughter Anne outlived her brothers and sister, becoming his heiress: she married Leicester Martin.
Knowledge 1: Leicester Devereux, 7th Viscount Hereford
Leicester Devereux, 7th Viscount Hereford (1674–1683) was a British Peer.He was the eldest son of Leicester Devereux, 6th Viscount Hereford (1617–1676) and succeeded to the title as an infant.He died young and was succeeded by his younger brother Edward.Edward died at the age of 25 in 1700 and the viscountcy passed to a Welsh cousin Price Devereux of Vaynor Park, Montgomeryshire.Edward's sister Anne outlived her brothers, becoming the heiress: she married Leicester Martin. [SEP] Knowledge 2: Price Devereux, 10th Viscount Hereford
Price Devereux, 10th Viscount Hereford( 9 June 1694 – 29 July 1748) was a British Tory politician who sat in the House of Commons from 1719 to 1740 when he succeeded to a peerage as Viscount Hereford.Devereux was the son of Price Devereux, 9th Viscount Hereford and his wife Mary Sandys, daughter of Samuel Sandys of Ombersley Court, Worcestershire.He entered Balliol College, Oxford in 1711.In 1719 Devereux was High Sheriff of Brecknockshire, having inherited the estate of the Morgans of Pencoyd near Hay- on- Wye.The same year he was returned unopposed at a by-election as Member of Parliament for Montgomeryshire.He was returned again for Montgomeryshire at the general elections of 1722 and 1727.In 1727 he was also returned as MP for Orford but preferred to represent Montgomeryshire where he was returned again at the 1734 general election.In 1740 he surrendered his seat when, on the death of his father, he succeeded to the peerage as Viscount Hereford, premier viscount of England, inheriting Vaynor Park in Montgomery.He married as his second wife( 1740) a daughter of William Price of Rhiwlas, Merioneth.On Devereux' death on 29 July 1748, the title passed to Edward Devereux, a distant cousin in Nantcribba, Montgomeryshire and the estate at Vaynor Park was sold.
Knowledge 1: Leicester Devereux, 6th Viscount Hereford
Leicester Devereux, 6th Viscount Hereford (1617 – 1 December 1676) was a British Peer.He was the second son of Walter Devereux, 5th Viscount Hereford (1578–1658).He married Elizabeth Withipoll, daughter and sole heiress of Sir William Withipoll who inherited Christchurch Mansion, Ipswich.His second wife was Priscilla Catchpole.His daughter Frances married William Tracy, 4th Viscount Tracy (1657–1712).He was succeeded by his sons
Leicester and Edward.His daughter Anne outlived her brothers and sister, becoming his heiress: she married Leicester Martin. [SEP] Knowledge 2: Price Devereux, 10th Viscount Hereford
Price Devereux, 10th Viscount Hereford( 9 June 1694 – 29 July 1748) was a British Tory politician who sat in the House of Commons from 1719 to 1740 when he succeeded to a peerage as Viscount Hereford.Devereux was the son of Price Devereux, 9th Viscount Hereford and his wife Mary Sandys, daughter of Samuel Sandys of Ombersley Court, Worcestershire.He entered Balliol College, Oxford in 1711.In 1719 Devereux was High Sheriff of Brecknockshire, having inherited the estate of the Morgans of Pencoyd near Hay- on- Wye.The same year he was returned unopposed at a by-election as Member of Parliament for Montgomeryshire.He was returned again for Montgomeryshire at the general elections of 1722 and 1727.In 1727 he was also returned as MP for Orford but preferred to represent Montgomeryshire where he was returned again at the 1734 general election.In 1740 he surrendered his seat when, on the death of his father, he succeeded to the peerage as Viscount Hereford, premier viscount of England, inheriting Vaynor Park in Montgomery.He married as his second wife( 1740) a daughter of William Price of Rhiwlas, Merioneth.On Devereux' death on 29 July 1748, the title passed to Edward Devereux, a distant cousin in Nantcribba, Montgomeryshire and the estate at Vaynor Park was sold.

Answer: Walter Devereux, 5th Viscount Hereford