Alexander the Great's conquest of the Persian Empire in 332 BC introduced Hellenistic culture to the Middle East. After Alexander's death in 323 BC, the empire split among his generals, and in the end much of Transjordan was disputed between the Ptolemies based in Egypt and the Seleucids based in Syria. The Nabataeans, nomadic Arabs based south of Edom, managed to establish an independent kingdom in 169 BC by exploiting the struggle between the two Greek powers. The Nabataean Kingdom controlled much of the trade routes of the region, and it stretched south along the Red Sea coast into the Hejaz desert, up to as far north as Damascus, which it controlled for a short period (85–71) BC. The Nabataeans massed a fortune from their control of the trade routes, often drawing the envy of their neighbours. Petra, Nabataea's barren capital, flourished in the 1st century AD, driven by its extensive water irrigation systems and agriculture. The Nabataeans were also talented stone carvers, building their most elaborate structure, Al-Khazneh, in the first century AD. It is believed to be the mausoleum of the Arab Nabataean King Aretas IV.