The term legion is derived from the Latin word "legio"; which ultimately means draft or levy. At first there were only four Roman legions. These legions were numbered "I" to "IIII", with the fourth being written as such and not "IV". The first legion was seen as the most prestigious. The bulk of the army was made up of citizens. These citizens could not choose the legion to which they were allocated. Any man "from ages 16–46 were selected by ballot" and assigned to a legion.