History of the East–West Schism
Disunion in the Roman Empire further contributed to disunion in the Church. The Emperor Diocletian famously divided the administration of the eastern and western portions of the Empire in the early 4th century, though subsequent leaders (including Constantine) aspired to and sometimes gained control of both regions. Theodosius the Great, who established Nicene Christianity as the official religion of the Roman Empire (see Edict of Thessalonica), was the last Emperor to rule over a united Roman Empire. Following his death in 395, the division into western and eastern halves, each for a few decades still under its own Emperor, was never reunited.
Last Roman Emperor
Saint Remigius, bishop of Reims and apostle of the Franks, baptised Clovis I, king of the Franks on 24 December 496. This baptism, leading to the conversion of the entire Frankish people to Nicene Christianity, was a momentous success for the Catholic Church and a seminal event in European history. He had a vision and prophesied that in the distant future, the last monarch who descended from the line of the kings of France, would be revealed and reestablish the Holy Roman Empire at the end of time. This prophecy was related through Hincmar, archbishop of Reims, and Rabanus Maurus Magnentius O.S.B., archbishop of Mainz. Marie-Julie Jahenny (1850-1941), also known as the "Breton" stigmatist, prophesied that Henry V, the Count of Chambord, was the chosen King. Despite his death, one of her predictions dated 1890 declares he is yet "reserved for the great epochs", i.e. the end of time.