Here is a list of medieval references for John Newburgh who died in 1381. John succeeded his father Thomas, who died in 1365; we have not found an Inquisition Post Mortem entry relating to this death, so do not know whether John was still a minor then. The first three references listed here are puzzling on date grounds - see the note at the foot of this page.

From other sources (e.g. Hutchins) John married Margaret, daughter and heir of Nicholas Poyntz, Baron of Curry Mallet. John was succeeded by a son, also called John, who was about 10 years old at the death of his father.

The references are listed in date order. Actual quotes are in italics.

 

# Document Date Text Notes
  Fine Rolls [h]
Vol 6 page 270
20 Jul
1350
[Appointements of tax collectors for Dorset, to John Newburgh among others] Not this John Newburgh (see the note below)
  Patent Rolls [g]
1350-54 pages 249 & 353
28 Apr  &
7 Nov 1352
Protection with clause nolumus, during pleasure, for the abbey of Bynedon, which is at the present time so depressed by debts, by frequent attacks of the king's alien enemies and by the coming there of mariners passing to foreign parts that its goods no longer suffice for payment of the debts of the abbot and convent; and appointment of Nicholas de Pointz and Robert Martyn, knights, and John de Novo Burgo to the keeping the abbey.

and

Because the abbey of Bynedon of the king's patronage, which is situated on the coast, is at present so burdened with debt and depressed by the frequent attacks of the king's alien enemies as well as by the coming of mariners calling there and passing by on their way to foreign parts that the goods thereof are not sufficient to pay the debts wherein the abbot and convent are bound to divers creditors, the king at their request has taken the abbey into his hands and under his protection, and has appointed John de la Hale and Robert Martyn, knights, and John de Novo Burgo to keep the same during his pleasure and apply all issues, rents and produce of the lands and possessions in discharge of the debts and relief of the state of the abbey, saving reasonable sustenance of the persons without whom the abbey cannot be ruled.
Provision for the safety of Bindon Abbey, suffering from attacks from sea and from a stream of navy visitors
  Patent Rolls [g]
1354-58 page 534
20 Apr 1357 Pardon to John de Leuston of the king's suit for the death of Thomas Randhous of the county of Dorset, whereof he is indicted, and of any consequent outlawry; the king having been informed by John de Neuburgh that he killed him in self defence.  
  Feet of Fines [j]

Volume 10, Page 99, Entry 247
1360 Sale of property in Fontmel Parva by John and Joan de Neuburgh to William and Alice de Stupelton Not the right John Newburgh, since his wife was Margaret
  Patent Rolls [g]
1377-81 page 473
20 Mar 1380 Commission to William de Monte Acuto, earl of Salisbury, Robert Rous, Robert le Filz Payn, John Chidyok, Edmund Fitz Herberd, Robert Turbervill, John de Neuburgh, Stephen Derby, Philip Walwayn, William Payn, Roger Bittesthorn, John Mautravers, Thomas Blount and the sheriff of Dorset, to array and equip all the men of that county between the ages of 16 and 60, and to keep them, the men-at-arms, hobeers and archers, in readiness to resist foreign invasion; with power to arrest and imprison the disobedient. Commission of array
  Patent Rolls [g]
1377-81 page 577
15 Nov 1380 Commission to Richard Rurburvyll, John Hameyn and John Neuburgh, knights, Roger Buttesthorn, John Fitelton and John Moulham, to enquire touching the dissipation, through default of the keepers and constables, of the possessions, rents, rights, customs and liberties of the caste and lordship of Corf, co. Dorset, and to return their inquisition into Chancery.  
  Inquistions post mortem [i]
Vol 15 page 228
8 Feb 1382 Hawise, late the wife of Thomas de Neuburgh
Dorset. Inq taken at Bemynstre, Monday the morrow of St Matthew, 6 Ric II. She held the undermentoned manor to her and the said Thomas, now deceased, and the heirs of their bodies, by a fine levied in the king’s court in 11 Edw III with the king’s licence.
Wynfred Neuburgh. The manor, held of the king in chief by knight’s service and by payment of 10s yearly to the sheriff of Dorset.
She died 21 January last. John Neuburh, aged 10 years and more, son and heir of John de Neuburgh, deceased, her son by the said Thomas, is her heir
 
  Inquistions post mortem [i]
Vol 15 page 229
12 Feb 1382 John Neuburgh, knight
Dorset. Inq taken at Bemynstre, Monday the morrow of St Matthew, 6 Ric II. He held the undermentioned manor of Estlulleworth in his demesne jointly with Margaret, his wife, who is still living. He held the undermentioned manor of Horsyth in his demesne jointly with the same Margaret, to wit, to him and her and his heirs.
Estlulleworth. The manor, held of Bernard Brocas, knight, by knight’s service. Horsyth. The manor, held of the abbot of Glastonbury by knight’s service.
He died on 5 June, 4 Ric II. John Neuburgh, aged 10 years and more, is his son and heir.
Writ to the escheator to certify the king in the Chancery as to the cause of the arrest and detention of John son and heir of John Neuburgh, knight. 30 Oct, 5 Ric II.
Dorset. Certificate by the escheator that, because it was found by an inquisition taken before Adam ate More, late escheator, and also by another inquisition taken by himself, that Thomas de Neubourgh, knight, grandfather of the said John, without the king’s licence demised certain lands etc. in Wynfred Neubergh which are held of the king in chief do divers tenants, to hold of him and his heirs for life, therefore the said lands etc. were seized into the king’s had and remain there, as appeared by the account of Thomas de Wellyngton, late escheator, and also by the said inquisition taken by himself; and that because John de Neuburgh, knight, son and heir of the said Thomas, died in his (the escheator’s) time in seisin of the fee of the said lands etc., the aforesaid John his son and heir a minor, therefore he (the escheator) arrested the said heir and detained him the king’s hand as his ward.
The death of John, succeeded by his son John, aged 10
  Fine Rolls [h]
Vol 9 page 301
18 Oct
1381
The like orders [to take into the king’s hand and keep safely until further order all the lands in his bailiwick whereof the named person, who held of the king in chief, was seised in his demesne as of fee on the day of his death, and to make inquisition touching his land and heir] touching the lands of the following persons, directed to the escheators in the counties named: John Neuburgh, knight; Dorset.

[This entry is repeated on 12 Feb 1382 (page 302)]
 
  Book of Aids [e] 1428 Dorset. Hundred of Wynfred. From John Faunteleroy and John Newburgh for half a fee in Combecanes, that John atte Hale formerly held; 3s. 4d. From John de Novo Burgo, senior, for second part of a fee in Est Lulleworth, that formerly was of John Newbourgh; 4s. 5d. Hundred of Colyfordestre. From John Newburgh and John Stourton for one fee in Brode Wey, that John de Tydelmyngton formerly held; 6s. 8d. Hundred of Bokelond. From John Newburgh for fourth part of a knight's fee in Wotton Glaunvyle, otherwise Wolverne Wotton, that Sibilla de Glaunvyle formerly held; 20d.
Somerset. Hundred of Kynmersdon. From the heir of John de Newbyry for a quarter part of a knight's fee in Lokyngton, that
John de Newebury formerly held; 20d.
Wiltshire. Hundred of Selkeley. John Newburgh holds from the earl of Salisbury various lands and tenements in Rokele, that once was of Robert Russell, for one knight's fee.
Working out which John is which is not easy! I have made my best guess, based on the assumption that the returns for different places will not necessarily name people consistently.
  Inquistions post mortem [i]
21-25 Hen VI page 49
31 Jan 1443 A very long entry for John Tiptoft, lord Tiptoft & Powys, provides in passing a long exposition on the Poyntz family inheritance. The relevant part is listed in full elsewhere.  
  History of the Reign of Henry VII Vol 2 P255 25 Feb 1488 [Inspeximus and exemplification of a commission dated 15 Nov, 1380, relating to the castle and lordship of Corf, co Dorset. The commissioners had been John Newborough, knight, Roger Bysthorne, and John de Mouldham. It was found that the whole Isle of Purbeck was a royal warren, appertaining to the castle; the whole town of Corfe also appertained to the castle, and the tenants in the town have rights similar to those of the tenants in the Cinque Ports]  

 

Dates: This John's grandfather, Robert, is known to have been born in 1292, since his reaching majority is recorded in 1313. John's father, Thomas, was born in or just before 1315, since his age is given as 23 or more at his father's death in 1338. We do not know John's year of birth, and do not even know whether he had reached the age of 21 at his father's death in 1365. We do know that his son (also called John) was born in or just before 1371, since his age is given as 10 or more at his father's death in 1381. Assuming that a child could not then have been born before the father had reached the age of about 16, this gives a bracket for this John's birth year, some time between 1331 and 1355.

 

This means that this John would have been too young to have been appointed as a tax collector in 1350. We have not been able to establish who this John Newburgh was - perhaps an uncle, but that is speculation. If there was another John Newburgh at this time, then a number of the references listed above may refer to him.