I am pretty sure Athens is the main city of Ancient Greece
There was a well developed and a highly efficient system of water management from the village level upwards in 900-1270 AD.The water tanks which came up during Chola Dynasty were too many but one stand out.Rajendra Chola built a huge tank named Solagangam in his capital city Gangaikonda Solapuram and was described as the liquid pillar of victory.About 16 miles long, it was provided with sluices and canals for irrigating the lands in the neighbouring areas.Another very large lake of this period, which even today seems an important source of irrigation was the Viranameri near Kattumannarkoil in South Arcot district founded by Parantaka Chola. Other famous lakes of this period are Madurantakam, Sundra-cholapereri, Kundavai-Pereri (after a Chola queen).
The first Europeans to have contact with the Ming Dynasty were the Portuguese.
It was Hongwu to rule first the Ming dynasty and had taken the Mongols out of China. The said Dynasty rose after the effort exerted by the Chinese to take away the Mongols who tried to invade. Ming dynasty was so full politically. The dynasty constitute of politically strict leaders
The trade during the Ming dynasty was based on foreign isolation that only the government can made trades with the foreign countries.
