Hi Peter.
Let me premise my remarks by saying that I am not an expert on the Immerseel (van Liere) family of this time period. I haven't reached this part of my study yet.
With respect to your first comment whereby you asked, "I don't follow the reasoning here - how does it appear that the knight
> Jan van Lier in the November 1350 charter is a son of the knight and
> allod proprietor Jan van Lier in the March 1350 Zandhoven charter rather
> than one and the same man in both documents?"
The simple answer is that I don't know. The information about the Immerseel family comes to us from secondary sources written centuries after the fact (16th - 19th). They are incomplete; some are based on fraudulent charters created by someone in Brabant, especially in the 16th century, to give a family or individual from that century a noble ancestor for which they were paid handsomely; in some cases, they arrived at conclusions by applying indirect logic because no primary documents were available; often these conclusions were found to be faulty. In addition, these writers seldom identified the charters from which the information was gleaned. With that said, it is entirely possible that both men were actually one and the same. Until I study the original charters from that time period I can't arrive at any other conclusion.
With respect to your second question concerning the logic of the subject, I can only reiterate my last point and add that sometimes the logic is immediately not apparent.
Let me start at the beginning. A document dated January 1277 (Old Date - 1278 New Date) confirms that the Lordship of Wommelgem was given by John, the first Duke of Brabant, as a fief to John de Lyra, knight, son of Arnold (I) de Lyra in the year 1277. That Lordship also contained a large area of land that was known as Immerseel (Ymmersele). In 1282, John de Lyra built a castle - the Kasteel van Immerseel on this land. His descendants began to use the family name van Immerseel (Ymmersele) but not exclusively and not immediately. Sometimes the charters mention them as - Van Lier van Ymmersele and sometimes van Lier, heer van Wommelgem and sometimes van Ymmersele. It's in reference to the heer van Wommelgem that we know that they were, in fact, van Immerseel (Ymmersele). However, Jan had a brother Arnold II van Lier, whose descendants retained the name van Lier as Arnold did not share in the Lordship of Wommelgem or the land of Immerseel (thereby the seal you refer to above). From this point forward, we have two separate lineages - van Liere and van Immerseel, with, for a couple of generations, the family van Immerseel continuing to be referred to as van Lier. This continued on well into the 16th century when we see some individuals being called van Lier van Immerseel. So, if it is confusing, it definitely is. The NIcholas van Lier that you mention in 1371 was a descendant of Arnold II. Because there were two separate branches, the possibility of the name Jan van Lier appearing in both branches is very high. The name Jan reappears generation after generation in both branches. In the middle of the 14th century, for example, we see three brothers, Godfried van Immerseel, Jan van Immerseel and Karel van Immerseel; each fathered a natural son named 'Jan'. In addition to fathering a 'natural' son 'Jan, Godfried also had a legitimate son he also named Jan. So in that immediate generation, we know of at least four men named 'Jan' just in one branch with one branch sometimes still being referred to a s van Lier.
You also asked, Can you please cite the early sources according to which a Jan van Lier
had a son of the same name born about 1341?
As I haven't made a study of this time period yet, I don't have any charters that I can refer you to. There are, however, a couple of sources that you could try - both by J. Th. De Raadt, Itegem et ses Seigneurs, 1894, p. 55; and Keerbergen et ses Seigneurs. The reference I have comes from a private study completed by a distant cousin of mine who passed away a few years ago and whose references I do not have. You might also try the following, I have not consulted them yet, but they may contain some information that you may find useful.
See S.A.A./ Antw.Archievenblad 27/ pag.150/ 151 and 152/ Act of 20-Febr.-1418/1419/ f°54 V°/ From Privilegiekamer, "The old register metten berderen"; in which it is determined how the family ties were arrived at / JAN den OUWEN / Oom / Voerbedde and Nabedde. Son of Hr.v.Immerseel Joannes (Jan) van Lier Schout/Antw.1384 van IMMERSEEL (v.Lier/v.Immerseel) Hr.v.Wommel. (see IX.1) and Vr.v.ter Elst Catharina van LEEFDAEL (possibly Maria ?).
Married (1) on 04-11-1350, church marriage on 04-11-1350 to Elisabeth van den OUDEN (van Ouden), born Hypot.1330. Lives 1350. Died ..-..-1374. Was still alive 1374. From the history of Grobbendonck by Goetschalcx S.A.A./ Bib. 1520, Part II pag.211.... According to a note left to us by the late Canon de Ridder, she was still alive in the year 1374. (1) State Archives in Brussels Spechtboek fol.43. Marries Jan van Immerseel. See Emiel Steenackers "Het laethof van Immerseel" in Boom, page 27.
See also S.A.A./BIB. "History of Grobbendonck" Part II, page 209, by Goetschalcx. 1355-6-November (vi days after Alreheylygen). Daughter of Jan van den OUDEN (van Ouden), Knight., and Wife v. N.N.
Married (2) to Concubine v.Jan, N.N. Concubine van Jan van Immerseel [2397], Lord of Meysse, from which a bastard son Hendrik van Immerseel was born.
Once I complete my present study, I will look at the 14th-century records in more detail. I may be able to provide more information at that time. If I have not answered your question to your satisfaction please let me know, and I will try again.
On another note, could you provide me with some insight into the following document dated January 1239 (old date - 1240 new date) concerning "Arnoldus de Lyra , canonicus beate Marie et, decanus Christianitis in Antwerpia"?
Could it have been possible for Arnold to have been married either before, after, or during the time he held the position of "canonicus beate Marie et, decanus Christianitis in Antwerpia" in this century? or was it necessary for him to have been absolutely celibate? Thank you.
[Antwerp] January 1239
Act by Arnoldus de Lyra , canonicus beate Marie et, decanus Christianitis in Antwerpia, notifies and confirms that the Abbey of Antwerpen (S . Michel) has purchased from an individual named Beda, two pieces of land located in Antwerp in the "Dekenstraat"
Uniuersis presentes litteras uisuris Arnoldus de Lyra, canonicus beate Marie, et, decanus Christianitatis in Antwerpia, salutem in Domino. Notum facimus uniuersitati uestre quod abbas et conuentus Sancti Michaelis in Antwerpia emerunt contra Bedam, uxore sua et liberis suis consentientibus, duos mansus allodii, sitos in platea, que dicitur Dekenstrate, in quibus idem Beda manet, pro quatuordecim libris Louaniensis monete. Quo facto, prefatus Beda cum libris suis coram conuentu supradicto et scabinis Antwerpiensibus in altari sancti Michaelis, ad opus prefate ecclesie in elemosinam dictam terram optulit et reportauit. Iidem uero abbas et conuentus predicto Bede et suis successoribus prefatos mansos contulerunt, hereditarie possidendos, pro uiginti solidis Louaniensibus annuatim, ipsis soluendis, conditione tali adiecta, in festo beati Iohannis Baptiste X solidos, in festo beati Stephani reliquos decem solidos annuatim ipsis soluere tenetur. Preterea si predictus Beda domos ,suas, in mansis predictis sitas, in posterum uendere uoluerit, poterit easdem sub conditione predicta. Et ne super hoc in posterum, calumpnia posset oriri, littere presentes sigillo nostro necnon et sigillo opidi Antwerpiensis, ad petitionem partium predictarum, sunt roborate. Testes frater L., prior, frater W., supprior, frater Ar., quondam abbas, et conuentus, Willelmus Draco, Hugo Tuckelant, scabini Antwerpienses, Salomon, clericus, filius ipsius Bede, et Henricus de Molendino, Ar. Bonne et Nicholaus Tote. Actum anno Domini M°CC°XXXIX° mense ianuario.