Called "beautiful Bactria, crowned with flags" by the Avesta, the region is one of the sixteen perfect Iranian lands that the supreme deity Ahura Mazda had created. One of the early centres of Zoroastrianism and capital of the legendary Kayanian kings of Iran, Bactria is mentioned in the Behistun Inscription of Darius the Great as one of the satrapies of the Achaemenid Empire; it was a special satrapy and was ruled by a crown prince or an intended heir. Bactria was the centre of Iranian resistance against the Macedonian invaders after the fall of the Achaemenid Empire in the 4th century BCE, but eventually fell to Alexander the Great. After the death of the Macedonian conqueror, Bactria was annexed by his general, Seleucus I.