A Swedish cousin of a cousin (we share cousins, but aren't cousins) sent me two links to Swedish family trees. The couple these both link to are my 5th great grandparents, Anders Spångberg and Stina Beata Birath - if the trees are correct, there may be a paper trail back to 10th and 11th great grandparents on two lines!!
http://www.skoghallsfk.se/Tomas/slakt/1914.htm
http://ingvarj.se/slakt2/family.php?famid=F385