The Age of Justinian and Theodora is a two-volume historical work written by British historian William Gordon Holmes and it presents a historical account of Byzantine Empire in 6th century A. D. Justinian the Great was the Byzantine emperor from 527 to 565 and his wife Theodora was very influential in the politics of the Empire. Justinian's reign is marked by the ambitious project known as the restoration of the Empire. A still more resonant aspect of his legacy was the uniform rewriting of Roman law, the Corpus Juris Civilis, which is still the basis of civil law in many modern states. His reign also marked a blossoming of Byzantine culture, and his building program yielded works such as the Hagia Sophia.

William Gordon Holmes (1845-1927) was a British historian best known for his work The Age of Justinian and Theodora, a history of Byzantine Empire during the reign of Emperor Justinian.