Viscount Thetford is in Viscountcies of England Alphabetically.
On 22nd April 1672 Henry Bennet 1st Earl Arlington [aged 54] was created 1st Earl Arlington, 1st Viscount Thetford and 1st Baron Arlington of Arlington in Middlesex with a similar remainder, and in default of heirs of his body, to his brother Sir John Bennet [aged 55] and the heirs male of his body. Elisabeth Nassau Beverweert Countess Arlington [aged 38] by marriage Countess Arlington. See Viscountcies of England Created with a Special Remainder.
On 28th July 1685 Henry Bennet 1st Earl Arlington [aged 67] died. His daughter Isabella [aged 17] succeeded 2nd Countess Arlington, 2nd Viscountess Thetford, 2nd Baroness Arlington of Arlington in Middlesex and 2nd Baroness Arlington of Arlington in Middlesex.
On 7th February 1723 Isabella Bennet Duchess Grafton [aged 55] died. Her son Charles [aged 39] succeeded 3rd Earl Arlington, 3rd Viscount Thetford, 3rd Baron Arlington of Arlington in Middlesex and 3rd Baron Arlington of Arlington in Middlesex.
On 6th May 1757 Charles Fitzroy 2nd Duke Grafton [aged 73] died. His grandson Augustus [aged 21] succeeded 3rd Duke Grafton, 3rd Earl Euston, 3rd Viscount Ipswich, 3rd Baron Sudbury, 4th Earl Arlington, 4th Viscount Thetford, 4th Baron Arlington of Arlington in Middlesex and 4th Baron Arlington of Arlington in Middlesex. Anne Liddell Duchess Grafton [aged 20] by marriage Duchess Grafton.
On 14th March 1811 Augustus Henry Fitzroy 3rd Duke Grafton [aged 75] died. His son George [aged 51] succeeded 4th Duke Grafton, 4th Earl Euston, 4th Viscount Ipswich, 4th Baron Sudbury, 5th Earl Arlington, 5th Viscount Thetford, 5th Baron Arlington of Arlington in Middlesex and 5th Baron Arlington of Arlington in Middlesex.
On 28th September 1844 George Henry Fitzroy 4th Duke Grafton [aged 84] died. His son Henry [aged 54] succeeded 5th Duke Grafton, 5th Earl Euston, 5th Viscount Ipswich, 5th Baron Sudbury, 6th Earl Arlington, 6th Viscount Thetford, 6th Baron Arlington of Arlington in Middlesex and 6th Baron Arlington of Arlington in Middlesex. Mary Caroline Berkeley Duchess Grafton [aged 49] by marriage Duchess Grafton.
On 26th March 1863 Henry Fitzroy 5th Duke Grafton [aged 73] died at Wakefield Lodge, Pottersbury. His son William [aged 43] succeeded 6th Duke Grafton, 6th Earl Euston, 6th Viscount Ipswich, 6th Baron Sudbury, 7th Earl Arlington, 7th Viscount Thetford, 7th Baron Arlington of Arlington in Middlesex and 7th Baron Arlington of Arlington in Middlesex. Marie Anne Louise Baring Duchess Grafton [aged 30] by marriage Duchess Grafton.
On 21st May 1882 William Henry Fitzroy 6th Duke Grafton [aged 62] died. His brother Augustus [aged 60] succeeded 7th Duke Grafton, 7th Earl Euston, 7th Viscount Ipswich, 7th Baron Sudbury, 8th Earl Arlington, 8th Viscount Thetford, 8th Baron Arlington of Arlington in Middlesex and 8th Baron Arlington of Arlington in Middlesex.
On 4th December 1918 Augustus Charles Lennox Fitzroy 7th Duke Grafton [aged 97] died in Wakefield Lodge, Pottersbury. His son Alfred [aged 68] succeeded 8th Duke Grafton, 8th Earl Euston, 8th Viscount Ipswich, 8th Baron Sudbury, 9th Earl Arlington, 9th Viscount Thetford, 9th Baron Arlington of Arlington in Middlesex and 9th Baron Arlington of Arlington in Middlesex. Susanna Mary Mctaggart Stewart Duchess Grafton by marriage Duchess Grafton.
On 10th January 1930 Alfred Fitzroy 8th Duke Grafton [aged 79] died. His grandson John [aged 15] succeeded 9th Duke Grafton, 9th Earl Euston, 9th Viscount Ipswich, 9th Baron Sudbury, 10th Earl Arlington, 10th Viscount Thetford, 10th Baron Arlington of Arlington in Middlesex and 10th Baron Arlington of Arlington in Middlesex. Rita Emily Carr-Ellison Duchess Grafton [aged 18] by marriage Duchess Grafton.
On 4th August 1936 John Charles William Fitzroy 9th Duke Grafton [aged 22] was killed racing his Bugatti at the Limerick Grand Prix. Earl Arlington, Viscount Thetford, Baron Arlington of Arlington in Middlesex and Baron Arlington of Arlington in Middlesex abeyant between his sisters Margaret Jane Fitzroy [aged 20] and Mary Rose Fitzroy [aged 17]. His first cousin once removed Charles [aged 44] succeeded 10th Duke Grafton, 10th Earl Euston, 10th Viscount Ipswich, 10th Baron Sudbury.