This is my most frustrating brick wall! John Gibson and Julia Orange are my 4x great grandparents, and I can't find anything about them before they were married (including their marriage record).
1852 census: http://automatedgenealogy.com/census52/View.jsp?id=20838
Discussion about John Gibson that cites his military record: http://www.bytown.net/gibson.htm
John Gibson is either from England or Ireland (the 1852 census says England, but I've seen people cite a military record that says Ireland). His age in the census suggests he was born in 1787, and the military record suggests 1781.
Julia is even more elusive. I got her maiden name from some of her children's marriage records. Occasionally people call her Julia Ann Hornsby Orange, though I haven't actually found a record that says that. The Internet seems to be full of people talking about her, yet not a record in sight!
Judging by the censuses, Julia was born around 1815-1821. Some of the censuses say she was born in Ontario, but most say Quebec.
Anything at all about these two would be helpful! A marriage record, a birth record for either one of them, anything. Julia's father was born in Ireland, according to her census records, so breaking this brick wall is my key to getting a Certificate of Irish Heritage! (And that would be so neat!)