Johannus Léopold Deumer
- Born in 1725
- Deceased on December 12, 1798, at the approximate age of 72 years
Family
- Married on November 11, 1756, with Anna Engel Gertrude Kersting (1741 - 1822), issuing
Maria Katharina (1761 - 1798)- Peter Heinrich (1762 - 1834)
- Katharina Eilsabeth (1766 - )
- Johann Leopold (1771 - 1840)
- Peter Wilhem (1775 - 1820)
- John Diedrich (1779 - 1780)