Freiherr or Grafe Heinecke

I am trying to find any information on this person. Friedrich Gottlieb
Heinecke possible Captain 3rd Hussars Kings German Legion according to a
death notice for his son in Australia.
In 1821 to 1829 that I know of he was Grafe der Borde Elsdorf (Court
Official in Elsdorf??) Mentioned on the Christening records for his children
in Elsdorf, which I have been given.
On his son's (Friedrich Wilhelm Heinecke b1822 Elsdorf died WA 1902) death
notice in Western Australia newspaper it says that father was Freiherr v.d.
Heinecke?
Who was he and where in Hannover did he come from? Can anyone help. I have
no idea when he married Dorothea Helms, but must have married later in life
after the wars. Maybe before 1821? Dorothea probably from around
Dannenberg/Uelzen/Luchow?
Any help appreciated....Alan