Birth: Mar. 7, 1337
Tattershall
East Lindsey District
Lincolnshire, England Death: Apr. 10, 1419
Horncastle
East Lindsey District
Lincolnshire, England
Maud Bernake, daughter of John Bernacke/Bernake and Joan Marmion, was born *March 7, 1337, at Tattershall, Lincoln, England and died on April 10, 1419, at Horncastle, Lincolnshire, England
Name Mary Deincourt

She married, before January 20, 1352, Baron Ralph de Cromwell VI, born about 1316, at Tattershall, Lincoln, England and died, aged 82 years, on August 27, 1398 at Horncastle as well.
His parents were: Ralph de Cromwell V and Anice Bellars.

Their children were:
Elizabeth, Maude, Baron Ralph de Cromwell VII and Hawise.
However there is another source indicating they had five sons: Ralph Knight, 2nd Lord Cromwell, Robert, William Knight, Thomas and John, and three daughters, Elizabeth, Amice (or Avice) and Maud.

Her siblings were: William and John.

Citations
(S37) BP2003 volume 1, page 982. See link for full details for this source. Hereinafter cited as (S37) Sir William Fitzwilliam 1 M. #325783
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From a further source:
Maud "Baroness Cromwell, Lady of Tattershall" Cromwell formerly Bernake also known as De Bernake was born about March 7, 1337 in Tattershall, Lincolnshire, England.
Daughter of John Bernake and Joan (Marmion) Bernake
Sister of William Bernake and John Bernake
Wife of Ralph Cromwell — married before January 20, 1352; (location unknown)
Mother of Elizabeth (Cromwell) Clifton, Maud (Cromwell) Fitzwilliam, Ralph Cromwell, Avice (de Cromwell) Bardolf, Elizabeth Cromwell and William Cromwell.
Died April 10, 1419 in Horncastle, Yorkshire, England

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The source for Documents #1-3 below is the online National Archives catalog at /www.catalogue.nationalarchives.gov.uk/search.asp?j=1 - provided by my sister.

"Maud (de Bernake) de Cromwell was not the direct heiress of Tattershall, Lincolnshire as suggested by Complete Peerage, nor did her father, Sir John de Bernake, ever hold this property.

Research indicates that Maud's great-grandmother, Joan (de Tattershall) de Driby, held the castle and manor of Tattershall as part of her inheritance, and was granted a fair there in 1315. In 17 Edward II (1323-4) Joan de Driby made a settlement of the castle and manor of Tattershall, on her younger son, Robert de Driby, for life, with reversion to Maud's paternal grandparents, William and Alice de Bernake

It appears that this settlement did not take effect, as the castle and manor of Tattershall were afterwards held by Joan de Driby's eldest son and heir, John de Driby.

Sometime before his death in 1334, John de Driby gave Tattershall to John de Kirketon, Knight, afterwards Lord Kirketon. Sir John de Kirketon subsequently made settlements of this property in 1343 and 1352-3.

Curiously, these settlements likewise did not take effect. On Lord Kirketon's death in 1367, the castle and manor of Tattershall were granted by the king to John de Driby's great-niece and heiress, Maud de Bernake and her husband, Sir Ralph de Cromwell"

See Complete Peerage, 7 (1929): 338-340 citing Cal. Close Rolls, 1364-1369, pp. 322-323. The bizarre descent of Tattershall, Lincolnshire and the failure of three successive settlements give ample testimony of the complexity of medieval land tenure.
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Will of Robert Bernak. Abstract in ELW, 32. Latin original.
20-26 July 1386. LAO Episcopal Register XII ff. 332v-333
Source: Douglas Richardson, Website: www.royalancestry.net

Lines taken from of an abstract of the 1386 will of her uncle, Robert de Bernake. Maud de Bernake is specifically mentioned in the will as the testators niece, she being called "lady of Tattershall." He leaves her "a missal, a doublet of red cloth and another of white linen." Maud is likewise named one of the executors of the will.
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*Note: by Douglas Richardson royalancestry@msn.com

"Complete Peerage gives no indication of Maud Bernakes birthdate, but various family inquisitions indicate that she was born about 1335-8, being aged 23 in 1360, and 24 or 26 in 1361, and aged 36 in 1382. I show that Ralph Cromwell and Maud Bernake were married before 20 January 1360/1, which date is a good deal earlier than the date employed by Complete Peerage."