In the second half of the first millennium BC the Arab tribes of South and West Arabia took control over the land trade of spices from South Arabia to the Mediterranean Sea. These tribes were the M'ain, Qataban, Hadhramaut, Saba and Himyarite. In the north the Nabateans took control of the trade route that crossed the Negev from Petra to Gaza. The trade enriched these tribes. South Arabia was called Eudaemon Arabia (the elated Arabia) by the Greeks and was on the agenda of conquests of Alexander of Macedonia before he died. The Indians and the Arabs had control over the sea trade with India. In the late second century BC, the Greeks from the Ptolemaic dynasty of Egypt learned from the Indians how to sail directly from Aden to the west coast of India using the monsoon winds (as did Hippalus) and took control of the sea trade via Red Sea ports.