Hello Ann Collins.
Its 2012 and you asked this question such a long time ago, I hope I can help.
My late mother Julia May Helen Campbell (nee Leth) was a descendant of Isaac Leth, ex Stadthauptmann (Mayor) of Arendal, Merchant and Ship owner 1757-1831. His son, the wild rogue, publican, schoolteacher, seller of illegal liquor and disgraced Ships Captain, Hans Helmer Leth was our Great, Great, Great Grandfather. He died in 1846 aged 70 but had 6 children:
Samuel Nicholai Leth, 1824-1864 ... my Great Great Grandfather.
Isaac Leth 1826 ... your Great Great Grandfather and father of Inga Bergitte Leth.
Mathias Bendix born 1829
Mathilde born 1833
Henriette born 1844 - Their mother Gjertrude Stiansdatter died in 1844 after giving birth to Henriette.
I might be able to offer you new information I have obtained recently. Please contact me @ firstname.lastname@example.org
distant cousin - Peter Campbell, Tasmania Australia