You were so helpful with Sundbye, how about Olsen?

Now that I have learned of Halfden Trygve Sundbyes family, how about his mother Anna Helene Olsen born 1838 in Oslo, Norway and married to Johan Jorgen Sundbye 2 May 1841 + Gacisgade? Her Father was Ole Olsen born about 1800, and her mother Dorothe torstndatter born abt 1805, We, OK YOU! have followed Dorothe Torstendatter out to her parents, but I am stuck on Ole Olsen. Any ideas who his parents were? I promise to stop at his parents. I know you have better things to do than do my work for me! Thank you! Sheila