HABIL

Human migrations took place also after the Bronze Age. The groups involved in these processes, however, were not as highly differentiated as during the Neolithic (Lazaridis et al., 2016), when the populations showed a degree of diversity similar to that existing between modern-day continental groups (Skoglund et al., 2014). Due to this situation, the genetic composition of Europe populations was starting to look like the modern-day pattern (Günther and Jakobsson 2016). DNA analyses, both on modern and ancient samples, contributed to the reconstruction of population events of the last three thousand years (e.g. Patterson et al., 2012;

Ralph and Coop, 2013; Hellenthal et al., 2014; Leslie et al., 2015; Busby et al., 2015;

Martiniano et al., 2016; Schiffels et al., 2016). Several studies on the British Isles population history focused on the Iron Age (Martiniano et al., 2016; Schiffels et al., 2016), the Roman period (Leslie et al., 2015; Martiniano et al., 2016), the Anglo-Saxon period (Leslie et al., 2015; Schiffels et al., 2016) and the Viking migrations (Leslie et al., 2015). The populations of the European mainland were shaped by several small and large-scale migrations (Ralph and Coop, 2013; Hellenthal et al., 2014; Busby et al., 2015) – originating within as well as

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outside Europe – which produced the isolation-by-distance pattern that we can see in modern Europeans (Menozzi et al., 1978; Lao et al., 2008; Novembre et al., 2008). It has also been suggested that the growing population size in Europe made later migrations less influential on demography since the reltive fraction of migrants was decreasing (Günther and Jakobsson, 2016).

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CHAPTER 3