A Transient Pulse of Genetic Admixture from the Crusaders in the Near East Identified from Ancient Genome Sequences

AI interpretationAI-generated

Ancient DNA reveals Crusaders mixed with locals, but left little genetic trace.

Researchers sequenced 13 ancient genomes from Lebanon (3rd–13th century CE), including nine Crusaders from a 13th-century mass grave in Sidon. All nine were male: some were Western Europeans, some locals, and two had mixed European–Near Eastern ancestry. This directly shows Crusaders and locals interbred. Yet today's Lebanese show no significant European admixture, and Lebanese Christians genetically resemble Roman-era locals from over 400 years before the Crusades.

• The Sidon 'Crusaders' pit' contained only males, including Western Europeans, locals, and two individuals of mixed European–Near Eastern ancestry.
• Direct evidence of admixture between Crusaders and the local Near Eastern population.
• Despite this mixing, no significant European admixture signal persists in any modern Lebanese group; Lebanese Christians are genetically similar to pre-Crusade Roman-era locals.

Sample interpretation

The study analyzed 14 ancient samples: 9 from the Crusader period (site 1025–1154) and 5 from the Roman period. Y-chromosome haplogroups were resolved for 10 males, including R-DF63, E-CTS11457, R-L151, T-CTS9882, J-BY61128, Q-Y6826, T-Y7381, and R-DF27. Mitochondrial haplogroups include T2, J1b4a1, H18, T1a-T152C!, HV1b-T152C!, and H-G13708A. These diverse lineages reflect both European and Near Eastern origins.

For genealogy enthusiasts

For ancestry enthusiasts, this shows that even historically documented migrations may leave little lasting genetic impact. Modern Lebanese ancestry largely reflects older local populations, not the Crusaders, highlighting how admixture signals can fade over centuries.