At its height, the Roman Empire was the largest Empire the world had known at the time. It covered areas of Europe, Mediterranean , Middle-East and North Africa.
However, governing such a vast land expanse can pose a number of challenges:
1. A number of different cultures, religions and languages always makes it difficult to manage a population with a single code of Law.
2. Local rebels can always pose a threat to the government. As new territory is annexed, many of its former political leaders can create problems by launching guerrilla warfare.
3. Efficient management of the government's money is very important. As the territory increases, there would be a need to establish government institutions such as police, mint, mail and other institutions to strengthen Rome's rule of law.
4. A huge standing army would be required to maintain and protect the vast Empire. This can be a huge cost and mutinies can make things even more difficult.
