Mughal is a corruption of the Persian word for Mongol. The mughals originated in Central Asia and were the descendants of the Mongol rulers TImur and Chengiz khan.
A Mughal name Babur established the Mughal empire in Pakistan and India in 16th and 17th centuries. Babur , Humayun, Akbar and Jehangir were four main rulers of the Mughal dynasty.
Babur established the mughal empire after winning the Battle of Panipat in 1526. He was the direct descendant of Genghis Khan. The Mughal empire was at its peak during the rule of Emperor Akbar, he was the most liberal of all the Mughal rulers. The Mughal empire started to decline after the death of emperor Aurangzeb in 1707.
A slave is a person that belongs to another one and is treated as property. Serfs, I'm not so sure about this now, were renting the land out from the landowners.
Since there are 12 Zodiacs in the Chinese Calendar, every 12 years, the same zodiac will come. So, if Year of The Dog was in 2028, add 12 years, and you'll get your answer.
