

http://thepeerage.com/p32196.htm#i321952
William de Washington was born circa 1180. He was the son of Patrick fitz Dolfin and Derdere (?)1 He died after 1220.1
He was also known as William de Hertburn. He lived at Washington, County Durham, EnglandG.1
Children of William de Washington
Marriage is not certain.
From < Wikipedia >
Margaret of Huntingdon (1145[1] – 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.
Margaret's second husband died in late 1181 and she then married the English nobleman Sir William Fitzpatrick de Hertburn who acquired the lands of Washington in Durham in 1183. This marriage also produced three children:
Margaret died in 1201 and was buried in Sawtry Abbey, Huntingdonshire. Her third and final husband had died around 1194.
Washington Irving version of the origin of the Washington family, from his "Life of George Washington" (vol. i. 1855), augmented by later research into the origin of the Nevilles of Raby. (Parentage is by no means consensually agreed on, and there are chronological issues.)
The Bolden Book was a survey made in 1183 by/for the Bishop of Durham:
"Willus de Hertburn habet Wessyngton (except ecclesia et terra ecclesie partinen) ad excamb, pro villa de Herteburn quam pro hac quietam clamavit: Et reddit 4 L., Et vadit inmagna caza cum 2 Leporar. Et quando commune auxillum venerit debet dare 1 Militem ad plus de auxilio, &c. Collectanea Curiosa. voll. ii, p. 80." (Version quoted by Irving - there are apparently 4 surviving copies of the MS, all with slight differences.) It boils down to William de Hertburn holding the manor of Wessington from the Bishop with payment of 4 pounds a year, two greyhounds for a great hunt, and one man-at-arms (variant: one mark) for communal defense.
Note: Sir William must have been at least 21, and probably older, by 1183. "Probably older" because he was already a landholder in his own right and exchanged those lands for Wessyngton-on-Tyne. It is unknown whether he had only one wife (Dowager Countess Margaret), or whether he was a widower with (one or two) sons when (and if) he married her.
Acquiring the Washington Name
https://www.wikitree.com/wiki/De_Washington-8
The Washington family name was acquired in 1183 when William fitz Patrick de Hertburn assumed tenancy of the Washington lands from the Bishop of Durham at a cost of four pounds per year. It was to his advantage to accept Washington in exchange for his Stockton lands since he was already heir to the lands at Offerton, which lie just across the River Wear from Washington. It was upon his acquisition of the Washington lands in 1183 that Sir William fitz Patrick de Hertburn became William de Wessynton I.[2]
1160 |
1160
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Probably, Hertburn, Northumberland, England
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1180 |
1180
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Wessyngton, Durham, England
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1185 |
1185
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Wessington-on-Tyne, Durham, England (United Kingdom)
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1192 |
1192
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Wessington, Durham, England (United Kingdom)
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1194 |
1194
Age 34
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Washington Manor, County Durham, England
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