549 BCE - 486 BCE: Susa is rebuilt and renovated by Persian King Darius the Great.
530 BCE: Persia conquers the Indus Valley.
525 BCE - 404 BCE: Persia conquers Egypt.
521 BCE: Darius I (Darius the Great) succeeds to the throne of Persia after the death of Cambyses.
520 BCE: Darius I of Persia fights the Scythians (not very successfully).
520 BCE: Darius of Persia links the Nile and the Red Sea by a canal.
518 BCE: Darius I The Great begins construction of the city of Persepolis.
515 BCE: Darius I moves the capital of Persia from Pasargadae to Persepolis.
513 BCE - 512 BCE: Darius I of Persia Campaigns against Scythians into European Scythia, past the Danube River, Scythians refuse to fight and Darius is forced to abandon the campaign due to lack of provisions.
499 BCE - 494 BCE: Ionian cities rebel against Persian rule.
499 BCE: Naxos is attacked by Darius' Persian forces.
492 BCE: Darius I of Persia invades Greece.
490 BCE: A combined force of Greek hoplites defeat the Persians at Marathon.
486 BCE: Xerxes succeeds to the throne of Persia after the death of Darius I.