sentence: heinzelmann however casts doubt on a male lineage relationship of stephan and siegfried and sees stephan i of sponheim as being lord of sponheim but not a count , notices that stephan i of sponheim documented 1075 as '' s ( igna ) stephani de spanheim '' with his seal in a document of udo , archbishop of trier , and proposes stephan to having married into the house of sponheim .