| Name | Role | Place | Source | |
|---|---|---|---|---|
| Amour Fidèle Constant Mathys | Witness | 1858 | Leuven | Civil registration marriages |
| Amour Parfait Fidèle Constant Mathys | Witness | 1862 | Leuven | Civil registration marriages |
| Constant Mathys | Witness | 1904 | Gijsegem | Civil registration births |
| Constant Mathys | Witness | 1902 | Gijsegem | Civil registration deaths |
| Constant Mathys | Deceased | 1992 | Gijzegem | Prayer card collection |
| Constant Mathÿs | Child | 1866 | Sint-Truiden | Civil registration births |
| Constant Mathÿs | Deceased | 1866 | Sint-Truiden | Civil registration deaths |
| Hendrik Constant Mathys | Registered | 1877 | Ninove | Population register |
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