DNA from medieval Crusader skeletons suggests surprising diversity

Enlarge (credit: Claude Doumet-Serhal)

European soldiers and civilians poured into the Levant in the 12th and 13th centuries, often killing or displacing local Muslim populations and establishing their own settlements in an effort to seize control of sites sacred to three major religious groups.

But in a new study, DNA from the skeletons of nine soldiers hints that the armies of the Crusades were more diverse and more closely linked with local people in Lebanon than historians previously assumed. The genetic evidence suggests that the Crusaders also recruited from among local populations, and European soldiers sometimes married local women and raised children, some of whom may have grown up to fight in later campaigns.

Living and dying side by side

For centuries, the mingled, charred bones of at least 25 soldiers lay buried in two mass graves near the ruins of the Castle of St. Louis, a 12th- to 13th-century Crusader stronghold near Sidon, in south Lebanon. Several of the skeletons (all apparently male) bore the marks of violent death, and the artifacts mingled with the bones-buckles of medieval European design, along with a coin minted in Italy in 1245 to commemorate the Crusades-mark the pit's occupants as dead Crusader soldiers, burned and buried in the aftermath of a battle. From nine of them, geneticist Marc Haber and his colleagues at the Wellcome Sanger Institute obtained usable DNA sequences, which offer a rare look into the ranks of the soldiers who fought on one side of the 200-year series of wars.

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