In Gibbon’s Chapters XXIX and XXX of his Decline and Fall one of his major sources is Claudius Claudianus, generally known as Claudian, the 4th century Alexandrian court poet of Theodosius and the Western generalissimo Stilicho.
Claudian wrote mostly in Latin. His texts in translation can be found at LacusCurtius and the Theoi Project.
While he is considered a major poet, his panegyrics and invectives make him a not too reliable historical source. Or, as Gibbon puts it:
The celestial gift, which Achilles obtained, and Alexander envied, of a poet worthy to celebrate the actions of heroes, has been enjoyed by Stilicho, in a much higher degree than might have been expected from the declining state of genius and of art. The muse of Claudian,(17) devoted to his service, was always prepared to stigmatise his adversaries, Rufinus or Eutropius, with eternal infamy; or to paint, in the most splendid colours, the victories andvirtues of a powerful benefactor. In the review of a period indifferently supplied with authentic materials, we cannot refuse to illustrate the annals of Honorius from the invectives, or the panegyrics, of a contemporary writer, but as Claudian appears to have indulged the most ample privilege of a poet and a courtier, some criticism will be requisite to translate the language of fiction or exaggeration into the truth and simplicity of historic prose.
At the end of Chapter XXX, Gibbon devotes a couple of (print) pages to Claudian, here online:
Among the train of dependents whose wealth and dignity attracted the notice of their own times, our curiosity is excited by the celebrated name of the poet Claudian, who enjoyed the favour of Stilicho, and was overwhelmed in the ruin of his patron. The titular offices of tribune and notary fixed his rank in the Imperial court. He was indebted to the powerful intercession of Serena for his marriage with a rich heiress of the province of Africa;(114) and the statue of Claudian, erected in the forum of Trajan, was a monument of the taste and liberality of the Roman senate.(115) After the praises of Stilicho became offensive and criminal, Claudian was exposed to the enmity of a powerful and unforgiving courtier whom he had provoked by the insolence of wit. He had compared, in a lively epigram, the opposite characters of two Praetorian praefects of Italy; he contrasts the innocent repose of a philosopher, who sometimes resigned the hours of business to slumber, perhaps to study, with the interested diligence of a rapacious minister, indefatigable in the pursuit of unjust or sacrilegious gain. "How happy," continues Claudian, "how happy might it be for the people of Italy if Mallius could be constantly awake, and if Hadrian would always sleep!"(116) The repose of Mallius was not disturbed by this friendly and gentle admonition; but the cruel vigilance of Hadrian watched the opportunity of revenge, and easily obtained from the enemies of Stilicho the trifling sacrifice of an obnoxious poet. The poet concealed himself, however, during the tumult of the revolution, and consulting the dictates of prudence rather than of honour, he addressed, in the form of an epistle, a suppliant and humble recantation to the offended praefect. He deplores, in mournful strains, the fatal indiscretion into which he had been hurried by passion and folly; submits to the imitation of his adversary the generous examples of the clemency of gods, of heroes, and of lions; and expresses his hope that the magnanimity of Hadrian will not trample on a defenceless and contemptible foe, already humbled by disgrace and poverty, and deeply wounded by the exile, the tortures, and the death of his dearest friends.(117)(118)(119) Whatever might be the success of his prayer or the accidents of his future life, the period of a few years levelled in the grave the minister and the poet: but the name of Hadrian is almost sunk in oblivion, while Claudian is read with pleasure in every country which has retained or acquired the knowledge of the Latin language. If we fairly balance his merits and his defects, we shall acknowledge that Claudian does not either satisfy or silence our reason. It would not be easy to produce a passage that deserves the epithet of sublime or pathetic; to select a verse that melts the heart or enlarges the imagination. We should vainly seek in the poems of Claudian the happy invention and artificial conduct of an interesting fable, or the just and lively representation of the characters and situations of real life. For the service of his patron he published occasional panegyrics and invectives, and the design of these slavish compositions encouraged his propensity to exceed the limits of truth and nature. These imperfections, however, are compensated in some degree by the poetical virtues of Claudian. He was endowed with the rare and precious talent of raising the meanest, of adoring the most barren, and of diversifying the most similar topics; his colouring, more especially in descriptive poetry, is soft and splendid; and he seldom fails to display, and even to abuse, the advantages of a cultivated understanding, a copious fancy, an easy and sometimes forcible expression, and a perpetual flow of harmonious versification. To these commendations, independent of any accidents of time and place, we must add the peculiar merit which Claudian derived from the unfavourable circumstances of his birth. In the decline of arts and of empire, a native of Egypt,(118) who had received the education of a Greek, assumed in a mature age the familiar use and absolute command of the Latin language;(119) soared above the heads of his feeble contemporaries; and placed himself, after an interval of three hundred years, among the poets of ancient Rome.(120)
In print:
Claudian: Volume I (Loeb Classical Library No. 135)
Claudian: Volume II (Loeb Classical Library No. 136)
This Book is well reviewed in JSTOR:
Claudian: Poetry and Propaganda at the Court of Honorius by Alan Cameron
Adrian Murdoch has blogged Claudian in connection with his book The Last Roman: Romulus Augustulus and the Decline of the West:
Claudian's de Bello Gothico; and here is comment on Claudian in another post of his: Eutropius and Asterius of Amasea.