At the time of his marriage in 1745 in Stuttgart, JOHANN GEORGE KNAPPLEN was a widower. He was a citizen and vine dresser in Stuttgart. MARIA CORDULA HAYLERS' birth certificate shows that her godfathers were H. Andreas Low & H. (?) Stell. Her godmothers were Frau Maria Cordula Schillingin & Frau von Hermann of Dettingen, Germany.
On his son's marriage certificate in Neckarrems in 1781 he was listed as a vinedresser in Cannstatt - today a suburb of Stuttgart.References:
Their German marriage license
Her German birth certificate
Son's German marriage license in Neckarrems in 1781
Son's German marriage license in Stuttgart in 1777