This group appeared around 35,000 years ago. Also known as Haplogroup R1b, it is descended from the Cro-Magnon people who were the continent’s first modern humans. This lineage is made up of Individuals who never acquired an additional marker such as M17 but do carry M173.
Southern England has a frequency of about 70% R1b. Ninety percent in Spain and Ireland. The last Ice Age is echoed in these geographical representations when the Cro Magnons were driven to warmer climates of Spain, Italy and the Balkans as they reduced in numbers and the ice retreated.
Many of the sublineages with R1b have not been well defined.