- D NA ▁results ▁show ▁that ▁ha p lo groups ▁I 2 a ▁and ▁R 1 a ▁together ▁stand ▁for ▁the ▁majority ▁of ▁the ▁make up . ▁According ▁to ▁several ▁recent ▁studies ▁Ser bia ' s ▁people ▁are ▁among ▁the ▁tall est ▁in ▁the ▁world , ▁after ▁Mont en eg ro ▁and ▁the ▁Netherlands , ▁with ▁an ▁average ▁male ▁height ▁of ▁. ▁ ▁History ▁ ▁Ar rival ▁of ▁the ▁S lav s ▁ ▁Early ▁S lav s , ▁especially ▁Sc la ven i ▁and ▁An ta e , ▁including ▁the ▁White ▁Ser bs , ▁inv aded ▁and ▁settled ▁the ▁S out he astern ▁Europe ▁in ▁the ▁ 6 th ▁and ▁ 7 th ▁centuries . ▁Up ▁until ▁the ▁late ▁ 5 6 0 s ▁their ▁activity ▁was ▁ra iding , ▁crossing ▁from ▁the ▁Dan ube , ▁though ▁with ▁limited ▁S lav ic ▁settlement ▁mainly ▁through ▁By z antine ▁fo eder ati ▁colon ies . ▁The ▁Dan ube ▁and ▁S ava ▁front ier ▁was ▁over wh el med ▁by ▁large - scale ▁S lav ic ▁settlement ▁in ▁the ▁late ▁ 6 th ▁and ▁early ▁ 7 th ▁century . ▁What ▁is ▁today ▁central ▁Ser bia ▁was ▁an ▁important ▁ge o - str ateg ical ▁province , ▁through ▁which ▁the ▁Via ▁Mil itar is ▁crossed . ▁This ▁area ▁was ▁frequently ▁intr ud ed ▁by ▁bar b ari ans ▁in ▁the ▁ 5 th ▁and ▁ 6 th ▁centuries . ▁The ▁numerous ▁S lav s ▁mixed ▁with ▁and ▁assim il ated ▁the ▁descend ants ▁of ▁the