* Divided the Roman Empire into four prefectures.
* Created new provinces and consolidated others.
* Reduced the power of the Praetorian Guard.
* Appointed more qualified governors from different social backgrounds.
* Developed a more formalized process for appointing and evaluating public officials.
* Revised the tax code to make it more equitable.
2. Military reforms:
* Created new military units, such as the numeri, which were specialized units composed of non-Roman soldiers.
* Improved training and discipline in the Roman army.
* Built new fortifications along the empire's frontier.
3. Building projects:
* Constructed the Pantheon in Rome, which is still standing today and considered one of the greatest examples of Roman architecture.
* Ordered the construction of the Temple of Venus and Roma, which was one of the largest temples in Rome.
* Built the Hadrian's Wall in Britain to mark the northern border of the Roman Empire.
4. Cultural and intellectual pursuits:
* Was a patron of the arts and literature, encouraging artists, scholars, and philosophers to come to Rome.
* Founded the Athenaeum, a center of learning and culture in Athens, Greece.
* Had a personal interest in Greek culture and philosophy.
* Sponsored educational reforms and expanded access to education.
5. Travel and exploration:
* Traveled extensively throughout the Roman Empire, visiting provinces and military installations.
* Had a passion for exploration and learning about different cultures.