Gernon of Derbyshire and Cambridgeshire, England
Matthew de Gernon [a] b abt 1108, of Mont-Bures, Essex, England, d aft 1161. He md Hodierna de Sackville abt 1130. She was b abt 1115.
Child of Matthew de Gernon and Hodierna de Sackville was:

Ralph de Gernon [b] b abt 1136, of Bakewell, Derbyshire, England. He md Daughter de Briwere, sister to Sir William de Briwere. She was b abt 1142, of Suffolk, England.
Child of Ralph de Gernon and Daughter de Briwere was:

Ralph de Gernon [c] b abt 1160, d 1247. The identity of his wife is unknown.
Child of Ralph de Gernon was:

William de Gernon [d] b abt 1184, of Cambridgeshire, England, d Dec 1258. The identity of his wife is not known.
Child of William de Gernon was:

Sir Ralph de Gernon [e] b abt 1212, of East Thorpe and Great Birch, Cambridgeshire, England, d 1274. He md Eleanor de Vere abt 1238, daughter of Sir Robert de Vere, Magna Carta Surety, Earl of Oxford, Master Chamberlain, and Isabel de Bolbec.
Child of Ralph de Gernon and Eleanor de Vere was:

William Gernon [f] b abt 1250, of East Thorpe and Great Birch, Cambridgeshire, England, d 1327. The identity of his wife is undetermined.
Child of William Gernon was:

Sir John Gernon [g] b abt 1293, of Bakewell, Derbyshire, and East Thorpe, Cambridgeshire, England, d abt 1333. He md [1] Isabel Bigot abt 1304, [2] Alice de Colville aft 1311, and [3] Margaret de Wygeton bef 1331/32. Alice de Colville was the daughter of Sir Roger de Colville, Lord of Colville, and Margaret/Margery de Braose.
Child of John Gernon and Alice de Colville was:

Margaret Gernon b abt 1314, of Bakewell, Derbyshire, and East Thorpe, Cambridgeshire, England. She md Sir Geoffrey de Gresley abt 1328, son of Sir Peter de Gresley and Joan de Stafford.

NOTES:
a. Often described as Matthew of Downham, his wife, Hodierna, was the sister and heir to her brother, William de Sackville.

b. He received Bakewell in Derbyshire from Richard I.

c. Granted East Thorpe and Birch by King John. He founded Lees Priory in 1230, and acquired Theydon Girnon in 1207.

d. He was Marshal of the King's Household. Usually accredited, from Morant's Essex as marrying Beatrix de Theydon, but Weis' Ancestral Roots, seventh edition, states that his wife's name is not known, and cites Chester of Chicheley.

e. He was lord of the manors of East Thorpe and Great Birch in Cambridgeshire. He married, secondly, Hawise, the sister and coheir of Nicholas de Tregoz of Tolleshunt.

f. Son and heir, stated to be aged 24 in 1274. The name of his wife is not known.

g. Stated to be aged 30-plus in 1327, he was first married very young to Isabel Bigot, who d s.p. at the age of 13 in 1311. His second wife, Alice de Colville, widow of Guy Gobaud, was the coheir in her issue of Bytham in Lincolnshire. Sir John Gernon married thirdly, Margaret, daughter and heir of Sir John de Wygeton, Knight.
SOURCES:
AR: Line 246[28-30].
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