Joannes Antonius Demaret
- Born: 6 Dec 1772, Bierges, , Brabant, Belgium
- Marriage (1): Catherine Françoise Jassonge on 21 Dec 1800 in Wavre, , Brabant, Belgium
- Died: 18 Jun 1859, Bierges, , Brabant, Belgium at age 86
Joannes married Catherine Françoise Jassonge, daughter of François Thomas Jassonge and Jeanne Lorent, on 21 Dec 1800 in Wavre, , Brabant, Belgium. (Catherine Françoise Jassonge was born on 18 Mar 1778 in Wavre, , Brabant, Belgium and died on 26 Dec 1853 in Bierges, , Brabant, Belgium.)
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