See Barriault p. 130.
Julien is perhaps the first-born of the 5 boys among the 7 known children of Perceval Gosse and Juliane Coupard, maybe arriving after the birth of his two sisters.
He was baptized on Thu 10 Feb 1633, aged 15 days (meaning his likely birthday was 26 Jan) at Champeaux. His godfather was his uncle - his mother's brother - Olivier Gosse, and his godmother was Catherine LeConte, wife of Gilles Coupard from Montviron parish. (The baby's mother was a Coupard, whose origins went back to Montviron, so this is probably another case in the apparently prevalent practice of inviting a relative to become godparent of one's child - in this area & era, at least).
Barriault apparently found no other information for him. But Julien Gosse (or a namesake) witnessed his mother's burial on 8 July 1682.[1]
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