Viscount Fitzwalter is in Viscountcies of England Alphabetically, Viscountcies of England Chronologically, Extinct Viscountcies of England.
Summary
18th June 1525. Robert Radclyffe 1st Earl of Sussex [aged 42] created. See Knighting of Henry Fitzroy.
27th November 1542. Son Henry Radclyffe 2nd Earl of Sussex [aged 35] succeeded.
17th February 1557. Son Thomas Radclyffe 3rd Earl of Sussex [aged 32] succeeded.
9th June 1583. Brother Henry Radclyffe 4th Earl of Sussex [aged 51] succeeded.
14th December 1593. Son Robert Radclyffe 5th Earl of Sussex [aged 20] succeeded.
22nd September 1629. First Cousin Once Removed Edward Radclyffe 6th Earl of Sussex [aged 70] succeeded.
August 1643. Edward Radclyffe 6th Earl of Sussex extinct.
On 18th June 1525 Henry Fitzroy [aged 6] was taken by barge to Bridewell Palace [Map] where he was enobled by his father King Henry VIII of England and Ireland [aged 33].
In the morning Henry Fitzroy was created 1st Earl Nottingham.
In the afternoon Henry Fitzroy was created 1st Duke of Richmond and Somerset.
Henry Percy 5th Earl of Northumberland [aged 47] carried the Sword of State. Thomas More [aged 47] read the patents of nobility. Charles Brandon 1st Duke of Suffolk [aged 41], Thomas Grey 2nd Marquess Dorset [aged 47],
Henry Courtenay [aged 29] was created 1st Marquess Exeter. Gertrude Blount Marchioness of Exeter [aged 22] by marriage Marchioness Exeter.
Henry Clifford [aged 32] was created 1st Earl of Cumberland, Warden of the West Marches and Governor of Carlisle Castle.
Thomas Manners [aged 33] was created 1st Earl of Rutland. Eleanor Paston Countess Rutland [aged 30] by marriage Countess of Rutland. He was given the Earldom of Rutland to reflect his descent from Anne York Duchess Exeter sister of the previous Earl of Rutland. At the same time his arms 
Manners Arms were augmented with the 
Manners Augmented Arms
Henry Brandon [aged 2] was created 1st Earl Lincoln.
Robert Radclyffe [aged 42] was created 1st Viscount Fitzwalter.
Thomas Boleyn 1st Earl Wiltshire and Ormonde [aged 48] was created 1st Viscount Rochford. Elizabeth Howard Countess of Wiltshire and Ormonde [aged 45] by marriage Viscountess Rochford.
Thomas Howard 3rd Duke of Norfolk [aged 52], William Fitzalan 11th or 18th Earl of Arundel [aged 49] and John de Vere 14th Earl of Oxford [aged 25] attended.
On 14th January 1537 Robert Radclyffe 1st Earl of Sussex [aged 54] and Mary Arundell Countess Arundel were married. She by marriage Viscountess Fitzwalter. They were sixth cousins.
On 27th November 1542 Robert Radclyffe 1st Earl of Sussex [aged 59] died. His son Henry [aged 35] succeeded 2nd Earl of Sussex, 2nd Viscount Fitzwalter, 11th Baron Fitzwalter. Anne Calthorpe 2nd Countess Sussex [aged 21] by marriage Countess of Sussex.
On 17th February 1557 Henry Radclyffe 2nd Earl of Sussex [aged 50] died. He was buried at St Lawrence Pountney Church. His son Thomas [aged 32] succeeded 3rd Earl of Sussex, 3rd Viscount Fitzwalter, 12th Baron Fitzwalter. Frances Sidney Countess Sussex [aged 26] by marriage Countess of Sussex.
On 9th June 1583 Thomas Radclyffe 3rd Earl of Sussex [aged 58] died. His brother Henry [aged 51] succeeded 4th Earl of Sussex, 4th Viscount Fitzwalter, 13th Baron Fitzwalter. Honora Pound Viscountess Fitzwalter by marriage Countess of Sussex.
On 14th December 1593 Henry Radclyffe 4th Earl of Sussex [aged 61] died. He was buried at Boreham, Essex [Map]. His son Robert [aged 20] succeeded 5th Earl of Sussex, 5th Viscount Fitzwalter, 14th Baron Fitzwalter.
On 22nd September 1629 Robert Radclyffe 5th Earl of Sussex [aged 56] died at Clerkenwell [Map]. His first cousin once removed Edward [aged 70] succeeded 6th Earl of Sussex, 6th Viscount Fitzwalter. His half first cousin Henry [aged 44] de jure 15th Baron Fitzwalter.
In August 1643 Edward Radclyffe 6th Earl of Sussex [aged 84] died. Earl of Sussex, Viscount Fitzwalter extinct.