Petronilla de la Mare
Petronilla de la Mare(" née" de Dunstanville, born 1248) was an English noblewoman.
The daughter and sole heir of Walter de Dunstanville, she married Robert de Montfort( d. 1274), a descendant of Hugh de Montfort who fought with William the Conqueror at the Battle of Hastings.
Her privileges are mentioned in the Hundred Rolls of 1274, the third of Edward the First.
After the death of her first husband, Petronilla married John de la Mare( d. 1313).
Humphrey de Bohun, 2nd Earl of Hereford
Humphrey( IV) de Bohun( 1204 – 24 September 1275) was 2nd Earl of Hereford and 1st Earl of Essex, as well as Constable of England.
He was the son of Henry de Bohun, 1st Earl of Hereford, and Maud FitzGeoffrey.
Isabel Marshal
Isabel Marshal (9 October 1200 – 17 January 1240) was a medieval English countess.
She was the wife of both Gilbert de Clare, 4th Earl of Hertford and 5th Earl of Gloucester and Richard, 1st Earl of Cornwall (son of King John of England).
With the former, she was a great grandmother of King Robert the Bruce of Scotland.
Arthur T. Horman
Arthur T. Horman (September 2, 1905 – November 2, 1964) was an American screenwriter whose career spanned from the 1930s to the end of the 1950s.
During that time he wrote the stories or screenplays for over 60 films, as well as writing several pieces for television during the 1950s.
Reginald of Piperno
Reginald of Piperno( or Reginald of Priverno) was an Italian Dominican, theologian and companion of St. Thomas Aquinas.
Reginald de Dunstanville, 1st Earl of Cornwall
Reginald de Dunstanville( c. 1110 – 1 July 1175)(" alias" Reginald FitzRoy, Reginald FitzHenry, Rainald, etc., French: Renaud de Donstanville or de Dénestanville) was an Anglo- Norman nobleman and an illegitimate son of King Henry I( 1100 – 1135).
He became Earl of Cornwall and High Sheriff of Devon.
John Argentine
John Argentine( died 1507) was an English physician who attended Edward V of England and later Arthur, Prince of Wales, and was Provost of King's College, Cambridge.
William Lindsay, 18th Earl of Crawford
William Lindsay, 18th Earl of Crawford and 2nd Earl of Lindsay( April 1644 – 6 March 1698) was a Scottish noble and politician.
Lindsay was the eldest son of John Lindsay, 10th Lord Lindsay of the Byres, 17th Earl of Crawford, and 1st Earl of Lindsay, by his wife, Lady Christian Hamilton, daughter of the Earl of Haddington.
William succeeded to the earldoms in 1678.
He was a zealous Presbyterian, president of the Convention parliament in 1689, a commissioner of the treasury in 1690, and one of the commissioners for settling the government of the Church of Scotland.
He married firstly Lady Mary Johnstone, daughter of 1st Earl of Annandale and Hartfell, in 1670.
They had one son:
He married secondly Lady Henrietta Fleming, daughter of Charles Seton, 2nd Earl of Dunfermline and widow of 5th Earl of Wigtown, and had further issue.
Patrick Ruthven, 1st Earl of Forth
Patrick Ruthven, 1st Earl of Forth and 1st Earl of Brentford( c. 1573 – 2 February 1651) was a Scottish nobleman, general, and diplomat.
Robert Stewart, 1st Earl of March
Robert Stewart, 1st Earl of Lennox then 1st Earl of March( c. 152229 March 1586) was a Scottish nobleman of the family of Stewart of Darnley.

Question: Who died later, Arthur T. Horman or Reginald De Dunstanville, 1St Earl Of Cornwall?
Answer: Arthur T. Horman