Robert Clifford, 4th Baron Clifford
Robert Clifford, 4th Baron de Clifford( d.1350) and lord of the honour of Skipton Craven was a member of the Clifford family in fourteenth- century England.
He was the son and heir of Robert, the third Baron and was aged somewhere between thirteen and sixteen on his father's death in 1344.
Young Robert married into the Neville family in April 1343 when he wed Euphemia, daughter of Ralph, Lord of Raby, in whose wardship Clifford had been placed.
He died in France without heirs, and without ever having come of age, in 1350.
Euphemia remarried within two years, to a son of Thomas, Lord Lucy, and lived until November 1393.
He was succeeded by his brother Roger de Clifford, 5th Baron de Clifford.
Thomas Clifford, 6th Baron Clifford
Thomas de Clifford, 6th Baron de Clifford, also 6th Lord of Skipton( c. 1363 – 1391) was a Knight of The Chamber, hereditary Sheriff of Westmorland, Governor of Carlisle Castle, and Warden of the West Marches.
John Russell, 27th Baron de Clifford
John Edward Southwell Russell, 27th Baron de Clifford (8 June 1928 – 2 November 2018) was Lord de Clifford in the Peerage of England.
Roger Clifford, 2nd Baron Clifford
Roger de Clifford, 2nd Baron de Clifford, also 2nd Lord of Skipton( 21 January 1300 – 23 March 1322) was a member of the Clifford family which held the seat of Skipton from 1310 to 1676.
He inherited his title when his father, Robert de Clifford, 1st Baron de Clifford died at the Battle of Bannockburn in 1314.
His mother was Maud de Clare, eldest daughter of Thomas de Clare, Lord of Thomond and Juliana FitzGerald.
Roger was also hereditary High Sheriff of Westmorland.
He was involved in a rebellion against King Edward II's favourite Hugh, Lord de Despencer, and ultimately against the King himself.
He took part in the Siege of Tickhill.
The rebel forces were then brought to battle by the King's forces in Boroughbridge in March 1322 at which Roger Clifford received severe wounds.
Forced to surrender, he was condemned to death and held captive in York.
He was hanged there, probably on 23 March, and his estates forfeited, including Skipton castle.
They were restored to Robert Clifford, 3rd Lord of Skipton in 1327.
Roger Clifford, 5th Baron Clifford
Roger de Clifford, 5th Baron de Clifford, ninth Lord Clifford, fifth Baron of Westmoreland (10 July 1333 – 13 July 1389), was the son of Robert de Clifford, 3rd Baron de Clifford (d. 20 May 1344), second son of Robert de Clifford, 1st Baron de Clifford (1273–1314), the founder of the northern branch of the family.
His mother was Isabella (d. 25 July 1362), daughter of Maurice, 2nd Lord Berkeley.
He succeeded his elder brother, Robert de Clifford, 4th Baron de Clifford in 1350, on which day he made proof of his age.
Thomas Percy (bishop of Norwich)
Thomas Percy was a medieval Bishop of Norwich.
He was the son of Henry de Percy, 2nd Baron Percy and Idonia, daughter of Robert de Clifford, 1st Baron de Clifford.
Percy was nominated 4 February 1355 and was consecrated on 3 January 1356.
He died on 8 August 1369.
Robert Clifford, 3rd Baron Clifford
Robert de Clifford, 3rd Baron de Clifford, also 3rd Lord of Skipton (5 November 1305–20 May 1344) was a member of the Clifford family which held the seat of Skipton from 1310 to 1676.
He was the second son of Robert de Clifford, 1st Baron de Clifford and Maud de Clare, eldest daughter of Thomas de Clare, Lord of Thomond and Juliana FitzGerald.
His title was restored to him in 1327 after being forfeited by his elder brother Roger de Clifford, 2nd Baron de Clifford who was hanged for treason.
He married Isabel de Berkeley, daughter of Maurice de Berkeley, 2nd Baron Berkeley at Berkeley Castle in 1328.
They had 7 children.
He was succeeded as Baron De Clifford by the eldest, Robert de Clifford, 4th Baron de Clifford
Edward Southwell, 20th Baron de Clifford
Edward Southwell, 20th Baron de Clifford (6 June 1738 – 1 November 1777) was a British politician.
Thomas Clifford, 8th Baron Clifford
Thomas Clifford, 8th Baron de Clifford, also 8th Lord of Skipton( 25 March 1414 – 22 May 1455), was the elder son of John, 7th Baron de Clifford, and Elizabeth Percy, daughter of Henry" Hotspur" Percy and Elizabeth Mortimer.
Henry Percy, 3rd Baron Percy
Henry Percy, 3rd Baron Percy of Alnwick( c. 1321– 1368), was the eldest son of Henry de Percy, 2nd Baron Percy( 1301 – 1352), and his wife, Idoine de Clifford( Idonea in Latin and also in English), daughter of Robert de Clifford, 1st Baron de Clifford.

Question: Who is the uncle of Roger Clifford, 5Th Baron Clifford?
Answer: Roger de Clifford, 2nd Baron de Clifford