Below is a list of historic writings from the Early Middle Ages!
Lactantius (250 - 325)
De Mortibus Persecutorum
Eusebius of Caesarea (260/265 - 339)
Chronicon
Church History
Life of Constantine
Onomasticon
Aurelius Victor (320 - 390)
De Caesaribus
Ammianus Marcellinus (330 - 391/400)
Roman History
Eutropius (363 - 387)
Breviarium Historiae Romanae
Orosius (375/385 - 420)
The Seven Books of History Against the Pagans
Socrates of Constantinople (380 - 439)
Historia Ecclesiastica
Sozomen (400 - 450)
Ecclesiastical History
Zosimus (5th Century)
New History
Boethius (480 - 524)
The Consolation of Philosophy
Procopius (500 - 565)
History of the Wars
On Buildings
Secret History
Anonymous (5th - 6th Century)
Anonymus Valesianus or Excerpta Valesiana
Jordanes (6th Century)
Getica
Romana
Cassiodorus (6th Century)
Variae
Multiple Authors (6th Century)
Code of Justinian
Isadore of Seville (560 - 636)
History of the Kings of the Goths, Vandals and Suevi
Anonymous (7th Century)
Chronicon Paschale
Bede (672/3 - 735)
Ecclesiastical History of the English People
Multiple Authors (9th Century)
Anglo-Saxon Chronicle