Which subjects besides Rome did Edward Gibbon discuss in the later volumes of The Decline and Fall?

In the later volumes of The Decline and Fall of the Roman Empire, Edward Gibbon expanded his narrative beyond the immediate political history of Rome to examine several significant cultural and institutional developments.

While maintaining his focus on the empire's long-term decline, he provided detailed discussions on the following subjects:

• Theology and Ecclesiasticism: Gibbon traced the evolution of religious institutions and the impact of theological disputes, such as the Trinitarian controversies, on the stability of the empire.1
• The Rise of Islam: He included a notable section detailing the emergence and expansion of Islam.1
• Roman Law: He provided an analysis of the history and development of Roman law, particularly within the context of the reign of Justinian.1
• Byzantine History: Despite his critical view of the Eastern Empire, he covered the history of Constantinople, including a detailed account of its final siege and capture.1
• Medieval and Renaissance Rome: The work concludes with an epilogue describing the state of Rome during the medieval and Renaissance periods, which Gibbon framed as a potential recovery of intellectual freedom.1