The Macedonia Alexander left in spring 334 BCE was principally the making of his father Philip II, though Philip’s ‘Macedonia proper’ had been largely a recovery of the Argead realm of Alexander I more than a century earlier. Early expansion from Pieria into the central plain of Bottiaea established a core of Argead control in Lower Macedonia. Following the retreat of Xerxes’ army after 479, Alexander I took full advantage of a power void to expand into the eastern region, conquering eastern Mygdonia, annexing Crestonia and Bisaltia eastwards to the Strymon valley and gaining control of rich supplies of mineral deposits and timber. Most of the eastern territory was lost after 450 BCE, but Philip II, in addition to recovering the old kingdom and consolidating Upper with Lower Macedonia, through conquest and diplomacy more than doubled the politically controlled territory of Macedonia. His transformation of Macedonia included the subjugation of Paeonians, Illyrians, Thracians and Triballians, the opening up of trade and securing of mining, control of Epirus, domination of Thessaly and the uniting of the southern Greek poleis under his hegemony. Alexander inherited a stable kingdom, a tested army of Macedonians, subordinate allies and a secure supply line to Asia.