Little is known of Lothair's youth. He was a posthumous child, born at Unterlüß in June 1075 shortly after his father, Gebhard of Supplinburg, died in the battle of Langensalza against troops loyal to the Emperor Henry IV.
[S36] Brian Tompsett, Dept of Computer Science, University of Hull, England(B.C.Tompsett@dcs.hull.ac.uk), Directory of Royal Genealogical Data, (This work is Copyright b 1994-2002 Brian C Tompsett).