Agriculture is thought to have developed independently throughout the
world, so there is not necessarily one particular group of people that
could be considered to be the first. However, of the available options
the most likley to be correct would be a) Nomads in Central Asia. The
'fertile crescent' in the East is often referred to in this respect, as
being the first place agriculture was properly developed.
He did that because rome started to fall and was taking pressure by north countries.Byzantium was the best solution because of it's geographic location and it could control the trade