Theodore Branas or Vranas (Greek: Θεόδωρος Βρανᾶς, Theodōros Branas) was a general under the Byzantine Empire and afterwards under the Latin Empire of Constantinople. He is called Li Vernas by western chroniclers of the Fourth Crusade, including Geoffroi de Villehardouin.
Theodore was the son of general Alexios Branas and of Anna Komnene Vatatzina. He was probably born in Adrianople, where his family held hereditary lands. In 1193, according to the chronicler Alberic of Trois-Fontaines, Theodore became the lover of the dowager empress Anna, then aged 22. She was the daughter of King Louis VII of France by his third wife Adèle of Champagne, and the sister of Philip II of France; she had originally come to Constantinople to be betrothed to Alexios II Komnenos, but Alexios was murdered by his co-emperor and regent Andronikos I Komnenos in 1183. She was then married to Andronikos, and was widowed on his violent death in 1185.
Theodore fought with limited success under Isaac II Angelos. Together with John Petraliphas, Michael Kantakouzenos and others, he was involved in the successful plot to replace Isaac with his brother Alexios III Angelos in 1195. He fought against various enemies under Alexios III. He was prominent in the initial defence of Constantinople against the Fourth Crusade, in 1202–1203.