Possible ancestors:

https://babel.hathitrust.org/cgi/pt?id=uc1.b2928597&seq=41
*John Lerchedekne + Cecil Jordan of Haccumb
*Richard + Jone Bosowr (John)
[Florence ???]

https://www.familysearch.org/library/books/viewer/206419/?offset=0#page=265
Page 479, Line 593
Thomas L'Arcedekne + Alice
Otes + Amice
Thomas + Maud
*John + Cecily Haccombe (Jordan + Isabel St. Aubin (Mauger))

https://archive.org/details/visitationsofcornwall1887/page/437/mode/1up
Mauger de Sancto Albin
Mauger de Sancto Albino
Stephen de Sancto Albino
Mauger de Sancto Albino of Pidekswell + Isabella
Mauger de Sancto Albino
Isabell + Jordan Haccombe

https://archive.org/details/dormantextinctba01bankuoft/dormantextinctba01bankuoft/page/n265/mode/1up
Thomas Le Archdekne + Elizabeth de la Roche (Thomas) (Maud in his IPM wa Eliz. a 1st wife)
*John + Cecily (Jordan Fitz-Stephen of Haccombe)

https://archive.org/details/visitationsofcornwall1887/page/490/mode/1up
*John Ercedekne + Cecil de Haccomb (Jordn)

https://archive.british-history.ac.uk/magna-britannia/vol3/lxxviii-lxxxix
his father the heiress of De le Roche;
* John le Archdekne + heiress of FitzStephen of Haccombe

https://archive.british-history.ac.uk/cal-papal-registers/brit-ie/vol2/pp263-268
1327. To John, eldest son of
Thomas le Ercedeakne, knight
* John + Cicely (Jordan de Haccombe, esquire

https://archive.british-history.ac.uk/inquis-post-mortem/vol7/pp253-262
Inquisitions Post Mortem, Edward III, File 27
345. THOMAS SON OF ODO LERCEDEKNE.
Writ, 21 August, 5 Edward III.
CORNWALL. Inq. Monday before the Nativity of the Blessed Mary, 5 Edward III.
Elerky, Lanrihorn and Laundegy. The manors (extents given), including the advowson of the church of Lanrihorn and a park there with wild beasts (feris bestiis), held of the gift of Michael de Frenouwil, for his life, by fine levied in the king’s court, with remainder, after the decease of the said Thomas, to John his son and the said John’s heirs by Cicely, daughter of Jordan de Haccombe, by service of rendering a greyhound at Bodmin, on Easter Day, to the steward of Cornwall.
Treberveth. The manor, viz.—5a. Cornish, held of the gift of the said Michael to the said Thomas and Maud his wife and the heirs male of their bodies, with remainder to the right heirs of the said Thomas, by service of 13s. 2 1/2d. yearly rent, in socage. All held of the king in chief, as of the honour of the castle of Launcevetone for life. Bodduan or Bodduuan. The manor (viz.—) 2 1/2 acres, held of the prior of Bodmin by service of 16d. at the feast of St. Michael, and an ewe with a hogg(et) at the feast of the Invention of the Holy Cross, in socage with common suit.
*John his son, aged 25 years and more, is his next heir.

https://archive.british-history.ac.uk/magna-britannia/vol6/pp250-272
At the time of making the Domesday survey, the manor was held by Stephen de Haccombe under Baldwin the sheriff. The heiress of Haccombe brought it to Sir John L'Ercedekne, or Archdeacon, whose son, Sir Warren, had two daughters co-heirs. ... the church of Haccombe was made a college or arch-presbytery by Sir John L'Ercedekne about the year 1341, pursuant to the intention of his father-in-law, Sir Stephen de Haccombe.

https://archive.org/details/journalofroyalin9188689roya/page/n529/mode/2up?q=Archdeacon
Journal of the Royal Institution of Cornwall by Royal Institution of Cornwall, v. 9 1886-89

in 1303, when an inquisition to ascertain the true value of the lands of Thomas le Krchedekne was held
In 1306 Thomas de Lerchedekne petitions Parliament
Odo le Archdeacon, who married Matilda * Harleian MS. 4031, Appendix I.
In 1308, Thos. Lercedekne was one of the Conservators of the Peace for the County of Cornwall, and in the following year was one of the Collectors of the Tax, and again the year after served in Scotland on military service; in 1311, he was one of the supervisors of array for the county ; in the next year he was governor of Tintagel Castle, and Knight of the Shire in 1318.

In 1314 Thomas Erchedekne was in the woeful fight of Bannockburn, and was there slain
Odo le Erchedekne I can glean little, he is mentioned as possessing part of the manor of Hlerky in 1303.
In 1313 he was one of the Knights of the Shire, as also in 1318 and the succeeding year.

Thomas le Erchedekne, who succeeded to the estates, married twice, his second wife being Maude daughter of John Mules.* Sir John Maclean} raises a question as to this, stating that she was undoubtedly the heiress of John De Tracy ; in 1840 she presented to the Church of St. Mabyn, in 1346 she held the moiety of a Knight’s fee in Trevisquite, which John De Tracy had held before; and in 1361 she again presented to St. Mabyn. To add to the difficulty, other authorities{ state that Thomas Erchedekne married Elizabeth or Alice, daughter and coheir of Thomas de la Roche, Lord of Roche; it will probably be the safest course to follow the Harleian MS. pedigree in this respect.

Thomas le Archedekne was summoned to Parliament yearly from 1320 to 1324 by writ, and was thus created a Baron by writ, the succeeding class to Barons by Tenure, as Barons by Letters Patent have superseded the former modes of enobling. He was one of the purveyors in Cornwall to victual the king’s army, and in 1321 was complained of as having committed enormities in the discharge of his trust, and in the same year he was ordered to abstain from attending the meeting of ‘‘Good Peers” illegally convened by the Harl of Lancaster to be held at Doncaster.

These were stormy times, and the homage and service of a knight for the land he held was no light duty.

As an example let us take the year 13822 and see what Thomas le Erchedekne was commanded by the king to do.

On the 6th of February he was enjoined to raise as many men at arms and foot soldiers as he could, and to hold himself in readiness to march with them to the king when summoned, which summons soon came, for he had to appear with his forces at the muster at Coventry on the first Sunday in Lent (Feb. 28), for the purpose of marching against the rebels or adherents of the Earl of Lancaster. On May 2nd he was summoned to the Parliament held at York. He was next resummoned to perform military service against the Scots, the muster being at Newcastleon-Tyne on July 24th. On November 14th, he was commanded to attend the Parliament at Ripon, and on November 27th he was commanded to assemble as many men at arms as he could over and above his usual train, and to be ready to proceed against the Scots in case of invasion, and on Dec. 10th he was ordered to March to York at the head of his men at arms to be ready at the muster.

In the next year also he was summoned to perform military service in person against the Scots, and also commanded to raise as many men at arms as he could over and above his contingent due by tenure, to attend the musters at York on 24th April, and at Newcastle on Tyne on the Ist July.

Thomas le Ercedekne died in 1331, and at the time of his death he held Elerky manor. Lanrihoern Manor, Landege Manor. Bodman Manor, and Trebernethe Manor

He was succeeded by his son John the second Lord, who married Cecil daughter and heir of Jordan of Haccombe or Sir Jordan Fitzpaine ; and with her acquired broad lands.

He still resided at Ruan, and in 1334 obtained a charter from the King for a market on Monday weekly at his village of Shepestall in Cornwall, and a yearly fair of three days’ duration on the eve, day, and morrow of Saint Margaret the virgin unless the said market and fair were hurtful to those adjoining* ; and in the same year a still more important step was taken, as he applied for and obtained a royal license to crenellate and fortify his house of Lanyhorn,} and at this date the castle if not actually rebuilt was enlarged, and thus became one of the finest and most splendid castles in Cornwall, with seven stately towers as described by Leland.

John Lerchedeken, Knight, died in 1378, leaving nine sons, Ralph, Warin, Richard, Otho, John, Robert, Martyn, Reynald, and Michell. Warin, who was knighted, married Elizabeth daughter and heir of John Talbot of Castle Richard, and left three daughters, Alienore the eldest was wedded to Sir Walter Lucy, Margeria born about 1391 and married to Sir Thos. Arundel of Tolverne, died childless October 26th, 1420, and her beautiful brass, one of the finest in Cornwall, still exists in East Anthony Church ; whilst Phillipa married Sir Hugh Courteney, Knight Banneret.

Richard the third son, who died 1408, married Joan Bosour and had one son Thomas who died s.p., and as Carew says ‘“ in whome the heirs male of this multiplyed hope tooke an end.”

According to another pedigree in Yeatman’s History of the House of Arundel, Odo le Erchedekne married Matilda....and their son Thomas le Erchedekne married Alice daughter and coheir of Thomas de la Roche Lord of Roche, and his son was the Sir John L’ Erchedekne, who married Cecilia Jordan of Haccombe.

https://www.medievalgenealogy.org.uk/fines/abstracts/CP_25_1_287_39.shtml
CP 25/1/287/39, number 234.
Link: Image of document at AALT
County: Devon. Cornwall.
Place: York.
Date: Two weeks from Holy Trinity, 12 Edward III [21 June 1338].
Parties: John, the archpriest (Archipresbiterus) of Haccoumbe, querent, and John Lercedekne and Cecily, his wife, deforciants.
Property: 2 acres of land in Haccoumbe and the advowson of the church of the same vill in the county of Devon and the advowson of the church of St Hugh of Quedyk' in the county of Cornwall.
Action: Plea of covenant.
Agreement: John Lercedekne and Cecily have granted to John the archpriest the land and advowsons and have rendered them to him in the court, to hold to John the archpriest and his successors, archpriests, of the chief lords for ever.
Warranty: Warranty by John Lercedekne and Cecily and the heirs of Cecily.
For this: John the archpriest has given them 20 marks of silver.
Note: This agreement was made by the command of the lord king.