Speth Family in Quedlinburg

Hello,

Can anyone help me find more about Johann Christoph Nepomuk Speth born About 1776 in Quedlinburg and died 13 Sep 1832 in Quedlinburg. He married (when and where?) Dorothea Gereke born about 1776 in Quedlinburg and died 24 Jan 1829 in Quedlinburg. Johann was a Hessian Grenadier soldier in the Napoleonic War. They had six children born in Quedlinburg: Johann Carl, Johann Andreas Friedrich, Johanna Dorothea Friederike, Johann Carl (a second child by the same name), Johanna Dorothea Antoinette and Dorothea Henriette.

Carl Spaeth