Mamluks were purchased, their status was above ordinary slaves, who were not allowed to carry weapons or perform certain tasks. In places such as Egypt from the Ayyubid dynasty to the time of Muhammad Ali of Egypt, mamluks were considered to be “true lords", with social status above freeborn Muslims.
Bronze statuette of the Roman fertility god Priapus, made in two parts. Dated to the 1st century A.D. Found in Rivery, Picardy, France in 1771 and is the oldest Gallo-Roman object in the collection of the Museum of Picardy. Wiki: http://commons.wikimedia.org/wiki/File:Mus%C3%A9e_Picardie_Arch%C3%A9o_03.jpg
The two warriors in the front are Thracian peltasts, the Greek warrior in the back is an Ekdromoi, who were armed like a hoplite but without armour. They were trained to purse enemy warriors that were defeated and started to run from the battlefield.