Realizing that the Roman Empire had become too large for a single ruler to control it: _____________

a. Constantine divided the empire in half and appointed a co-emperor to rule the western part.
b. Constantine built a new capital city named Constantinople in Palestine;
c. Diocletian divided the empire in half and appointed a co-emperor to rule the western part;
d. Diocletian resigned his position as emperor and encouraged the development of regional republics;
e. Diocletian abandoned some of the most marginal provinces of the Roman Empire such as Egypt and Britannia.