Jean was born about 1075, the son of Dude de Mareuil and Adélaïde de Châlon. The place is not known.
His wife was Adélaïde de Roucy d'Arcis-sur-Aube, who he married in ABT 1095. The place has not been found. Their two known children were Helvide (c1100-c1170) and Jean II (c1095-1127).
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Jean de Mareuil |
Dude de Mareuil |
Dude I de Mareuil |
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Adélaïde de Châlon |
Eustache de Châlon |
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| Event | Date | Details | Source | Multimedia | Notes |
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| Birth | ABT 1075 |
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| Attribute | Date | Description | Details | Source | Multimedia | Notes |
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| Nobility Title | vicomte de Mareuil-sur-Ay | |||||
| Nobility Title | 1114 | seigneur de Neufchâtel |