Johan Thorsen / Mari Amundsdatter

I am searching for more additional information about my ancestors Johan Thorsen and Mari Amundsdatter. They were married 22 May 1805. This is recorded in Fron 1799 - 1816 Ministerialbok page 306. I have them both on the 1801 census. He age 33 a Nat. Soldat living with his brother Morten. She age 25 a Tienestefolk. His death is recorded twice. Fron 1816-1827 Ministerialbok page 120 and Fron/Kvikne 1816-1850 page 102. I have not been able to find her death. I would like to find record of their birth and the name of parents. The parish records do not seem to go back that far. He being a national Soldier I am wondering if there might be military records that would give me that information? Also in 1801 she is living under the roof of a Peder Thorsen. Could this be an older brother? He seems a little old but I guess anything is possible. Any suggestions would be greatly appreciated. Marlon Henvit Reno, Nevada USA