Humbert de Champagne, of Virtis & Blois

To date, no primary source supports this person profile.

FMG: Central France – Blois, Tours (29 Jan 2022) "Comtes de Blois [943)-1218":
1. [HUMBERT de Blois (? - young). Comte de Vertus. Humbert is shown by Weir[198] as the oldest son of Comte Etienne, but the primary source on which this information is based has not yet been identified.]

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From a 1750 book titled L’art de Verifier les Dates des Fait Historique... , there is a short biography about Étienne, which names Humbert as a son. In the multi-work, there are no source citations to most persons, places, and dates. The tomes have been cited as sources by genealogists. From page 628:.

FR: L’an 1089, ou 1090, ETIENNE, qui est encore appellé Henri, 6° Comte de Blois, fut du vivant de Thibaut III son père, Comte de Meaux et de Brie, vers l’an 1081. Après sa mort, il eut pour son partage le Comté de Blois et de Chartres. Etienne fut tué en Palestine dans un combat contre les Sarrazins l’an 1102. Il avoit épousé l’an 1081, Alix ou Adèle fille de Guillaume I Roi d’Angleterre, dont il eut 5 fils et 2 filles; savoir, 1e. Guillaume, qui épousa une fille de la Maison de Sully, dont il prit le nom; 2e. Thibaut IV; 3e. Etienne, qui fut Roi d’Angleterre l’an 1135, par la mort du Roi Henri son oncle; 4e. Henri, d’abord Moine de Cluni, ensuite Évêque de Vincestre; 5e. Humbert mort jeun; les deux filles sont, Alix mariée à Miles Comte de Bray, et Mahaut femme de Richard Comte de Cestre. On lui donne une 3e fille nommée Eleonor, marieé à Raul Comte de Vermandois.

EN: The year 1089, or 1090, ÉTIENNE, who is still called Henri, 6th Count of Blois, was—during the lifetime of Thibaut III his father—Count of Meaux and Brie around the year 1081. After his [father%E2%80%99s] death, [%C3%89tienne] had for his division the County of Blois and Chartres. Étienne was killed in Palestine in a fight against the Saracens in the year 1102. He had married the year 1081, Alix or Adele—daughter of William I King of England—of whom he had 5 sons and 2 daughters; namely, 1st, Guillaume, who married a daughter of the House of Sully, whose name he took; 2nd. Thibaut IV; 3rd. Stephen, who was King of England in the year 1135, by the death of King Henry his uncle; 4th. Henri, first Monk of Cluni, then Bishop of Vincestre; 5th. Humbert died young; the two daughters are, Alix married to Miles Comte de Bray, and Mahaut wife of Richard Comte de Cestre. He was given a 3rd daughter named Eleonor, married to Raul Comte de Vermandois. [edited auto-translation]

Notes: Three Benedictine monks of the congregation of Saint-Maur compiled a multi-volume work covering a massive swath of history. Sadly, their prodigious works does not qualify a secondary source ranking; they did not include primary source assignations. Hopefully, the manuscripts they used still exist somewhere and are legible.

thepeerage.com information about "Humbert de Blois, Comte de Virtus". The title and place to the time showing are insupportable.
1. Humbert died as a child. Calling him a "comte" only makes sense as a posthumous, honorary title.
2. There was no "comte de Virtus" until Jean Galéas Visconti (1351-1402). See also: Vertus: Histoire
3. The name "Humbert" is not mentioned by Wikipédia français in its "Liste des comtes de Blois".
4. No Wikipedia webpage in any language provides a primary source about Humbert.