Philip II of Macedon absorbed the regions of Upper Macedonia (Lynkestis and Pelagonia) and the southern part of Paeonia (Deuriopus) into the kingdom of Macedon in 356 BC. Philip's son Alexander the Great conquered the remainder of the region and incorporated it in his empire, reaching as far north as Scupi, but the city and the surrounding area remained part of Dardania. After the death of Alexander, Celtic armies began to bear down on the southern regions, threatening the kingdom of Macedon. In 310 BC, they attacked the area, but were defeated.