Crusaders 'left genetic legacy' The genetic signature can be traced to Europe Scientists have detected the faint genetic traces left by medieval crusaders in the Middle East. The team says it found a particular DNA signature which recently appeared in Lebanon and is probably linked to the crusades. The finding comes from the Genographic Project, a major effort to track human migrations through DNA. Details of the research have been published in the American Journal of Human Genetics. The researchers found that some Christian men in Lebanon carry a DNA signature hailing from Western Europe. The scientists also found that...