Conan III, Duke of Brittany
Conan III, also known as Conan of Cornouaille and Conan the Fat (c. 1093–1096 – September 17, 1148) was duke of Brittany, from 1112 to his death.
He was the son of Duke Alan IV and Ermengarde of Anjou.
Conan III allied himself with Stephen of England in Stephen's war against the dispossessed Empress Matilda.
Margaret of Huntingdon, Duchess of Brittany
Margaret of Huntingdon( 1145–1201) was a Scottish princess and Duchess of Brittany.
She was the sister of Scottish kings Malcolm IV and William I, wife of Conan IV, Duke of Brittany, and the mother of Constance, Duchess of Brittany.
Her second husband was Humphrey de Bohun, hereditary Constable of England.
Following her second marriage, Margaret styled herself as the Countess of Hereford.
Guerech, Duke of Brittany
Guerech of Brittany, was Count of Nantes and Duke of Brittany from 981 to 988.
Alan IV, Duke of Brittany
Alan IV (born circa 1063; died 13 October 1119) was Duke of Brittany from 1084 until his abdication in 1112.
He was also Count of Nantes (from c. 1103) and Count of Rennes.
His parents were Duchess Hawise and Duke Hoel II.
He is also known as Alan Fergant.
Through his father, he was of the Breton House of Cornouaille dynasty (Breton: "Kerne" dynasty).
He was the last Breton-speaking Duke of Brittany.
Conan II, Duke of Brittany
Conan II of Rennes( c. 1033 – 11 December 1066) was Duke of Brittany, from 1040 to his death.
Conan was the eldest child and heir of Alan III, Duke of Brittany by his wife Bertha of Blois, and member of the House of Rennes.
He was the elder brother of Hawise, who succeeded him as" suo jure" duchess.
Matilda FitzRoy, Duchess of Brittany
Maud or Matilda Fitzroy, was a duchess consort of Brittany by her marriage to Conan III, Duke of Brittany.
She was an illegitimate daughter of Henry I of England by one of his unknown mistresses.
Hawise of Normandy
Hawise of Normandy( died 21 February 1034) was Countess of Rennes, Duchess of Brittany and Regent to her son Alan III, Duke of Brittany from 1008 until 1026.
Bertha, Duchess of Brittany
Bertha of Cornouaille( fl. 1125- 55), also known as Bertha of Brittany, was hereditary Duchess of Brittany between 1148 until her death and Dowager Countess of Richmond.
Bertha was the eldest daughter of Conan III of Brittany by Maude, the illegitimate daughter of King Henry I of England.
She was the last member of the Breton House of Cornouaille to reign over Brittany.
Otto III, Duke of Pomerania
Otto III, Duke of Pomerania( 29 May 1444 – 7 September 1464) was a member of the House of Griffins and a Duke of Pomerania- Stettin.
Henry III, Duke of Mecklenburg
Henry III, Duke of Mecklenburg( 1337 – 24 April 1383) was Duke of Mecklenburg from 1379 until his death.

Question: When did Conan Iii, Duke Of Brittany's father die?
Answer: 13 October 1119