| Name | Role | Place | Source | |
|---|---|---|---|---|
| Cesar Josephus Longuet | Witness | 1858 | Sint-Gillis | Civil registration marriages |
| Cesar Josephus Longuet | Groom | 1856 | Sint-Gillis | Civil registration marriages |
| Cesar Longuet | Witness | 1854 | Sint-Joost-ten-Node | Civil registration marriages |
| César Joseph Longuet | Father | 1860 | Tournai | Civil registration births |
| César Joseph Longuet | Groom | 1865 | Brussel | Civil registration marriages |
| César Joseph Longuet | Father of bride | 1905 | Elsene | Civil registration marriages |
| César Joseph Longuet | Father of groom | 1887 | Elsene | Civil registration marriages |
| César Longuet | Witness | 1864 | Elsene | Civil registration marriages |
| Hippolyte Albert Cesar Longuet | Deceased | 1983 | Rouen | Civil registration deaths |
| Hippolyte Albert Cesar Longuet | Deceased | 1983 | Rouen | Civil registration deaths |
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