It was the centre of Vedic and later forms of Hinduism. Gandhara was frequently mentioned in Vedic epics, including Rig Veda, Ramayana and Mahabharata. It was the home of Gandhari, the princess of Gandhara Kingdom. Ancient history Alexander's conquests In the spring of 327 BC Alexander the Great crossed the Indian Caucasus (Hindu Kush) and advanced to Nicaea, where Omphis, king of Taxila and other chiefs joined him. Alexander then dispatched part of his force through the valley of the Kabul River, while he himself advanced into Bajaur and Swat with his light troops. Craterus was ordered to fortify and repopulate Arigaion, probably in Bajaur, which its inhabitants had burnt and deserted. Having defeated the Aspasians, from whom he took 40,000 prisoners and 230,000 oxen, Alexander crossed the Gouraios (Panjkora) and entered the territory of the Assakenoi and laid siege to Massaga, which he took by storm. Ora and Bazira (possibly Bazar) soon fell. The people of Bazira fled to the rock Aornos, but Alexander made Embolima (possibly Amb) his base, and attacked the rock from there, which was captured after a desperate resistance. Meanwhile, Peukelaotis (in Hashtnagar, north-west of Peshawar) had submitted, and Nicanor, a Macedonian, was appointed satrap of the country west of the Indus. Mauryan rule Mauryan rule began with Chandragupta Maurya displacing the Nanda Empire, establishing the Mauryan Empire. A while after, Alexander's general Seleucus had attempted to once again invade the subcontinent from the Khyber pass hoping to take lands that Alexander had conquered, but never fully absorbed into this empire. Seleucus was defeated and the lands of Aria, Arachosia, Gandhara, and Gedrosia were ceded to the Mauryans in exchange for a matrimonial alliance and 500 elephants. With the defeat of the Greeks, the land was once more under Hindu rule. Chandragupta's son Bindusara further expanded the empire. However, it was Chandragupta's grandson Ashoka, who converted to Buddhism and made it the official state religion in Gandhara and also Pakhli, the modern Hazara, as evidenced by rock-inscriptions at Shahbazgarhi and Mansehra. After Ashoka's death the Mauryan empire fell to pieces, just as in the west the Seleucid power was waning. Indo-Greeks The Indo-Greek king Menander I (reigned 155–130 BCE) drove the Greco-Bactrians out of Gandhara and beyond the Hindu Kush, becoming king shortly after his victory. His empire survived him in a fragmented manner until the last independent Greek king, Strato II, disappeared around 10