The Han Dynasty is credited with the following advances in civilization EXCEPT for use of legalism inventing the wheelbarrow making paper out of pulp the use of acupuncture

Both countries had to aprove annexation.

The founder of the byzantine  empire  and its first  emperor,  constantine  the great,  movedthe  capital of the roman empire  to the city of byzantium in 330 ce, and renamed it  constantinople.  constantine  the great also legalized christianity, which had previously been persecuted in the  roman empire.