Sources

1) Source: The Henry Project . External Link
https://fasg.org/projects/henryproject/data/lance000.htm. Reference: Landry (alias Lancelin) de Baugency (Questionable reliability of evidence)
2) Source: The Henry Project . External Link
https://fasg.org/projects/henryproject/data/john0000.htm. Reference: Jean de La Flèche (Johannes de Fissa) (Questionable reliability of evidence)
3) Source: The Ecclesiastical History of England and Normandy: Volume III "Elias, son of John and Paula, and cousin of Hugh count of Maine, was distinguished for his piety to God… He married an illustrious lady, Matilda, daughter of Gervase, who was the son of Robert surnamed Brochard, brother of Gervase, archbishop of Rheims… His wife bore him a daughter named Eremburga, who, when she became marriageable, was espoused to Fulk, then Count of Anjou, and who is now king of Jerusalem, and gave birth to an illustrious progeny, Geoffrey and Elias, Matilda and Sybilla ; the daughters marrying the sons of kings, but by God's providence which disposes all things well, they soon became widows." (Data from secondary evidence)
4) Source: The Henry Project . External Link
https://fasg.org/projects/henryproject/data/fulk0004.htm. Reference: Foulques (Fulk, Fulco) IV "le Rechin" (Questionable reliability of evidence)