Theodore was of
Greek descent and was born in
Tarsus in Cilicia, a Greek-speaking diocese of the
Byzantine Empire. Theodore's childhood saw
devastating wars between Byzantium and the Persian
Sassanid Empire, which resulted in the capture of
Antioch,
Damascus, and
Jerusalem in 613–614. Persian forces captured Tarsus when Theodore was 11 or 12 years old, and there is evidence that Theodore had experience of Persian culture. It is most likely that he studied at
Antioch, the historic home of a distinctive school of
exegesis, of which he was a proponent. Theodore also knew Syriac culture,
language and
literature, and may even have travelled to
Edessa. The Syriac
Acts of St.
Milus of Persia, which was incorporated into the
Old English Martyrology, was probably brought to England by Theodore. Though a Greek could live under Persian rule, the
Muslim conquests, which reached Tarsus in 637, certainly drove Theodore from Tarsus; unless he fled even earlier, Theodore would have been 35 years old when he left his birthplace. Having returned to the Eastern Roman Empire, he studied in the Byzantine capital of
Constantinople, including the subjects of astronomy, ecclesiastical
computus (calculation of the date of Easter), astrology, medicine, Roman civil law, Greek rhetoric and philosophy, and the use of the horoscope. At some time before the 660s, Theodore had travelled west to Rome, where he lived with a community of Eastern monks, probably at the monastery of St. Anastasius. At this time, in addition to his already profound Greek intellectual inheritance, he became learned in Latin literature, both sacred and secular. The
Synod of Whitby (664) having confirmed the decision in the
Anglo-Saxon Church to follow Rome, in 667, when Theodore was aged 66, the see of Canterbury happened to fall vacant.
Wighard, the man chosen to fill the post, unexpectedly died. Wighard had been sent to
Pope Vitalian by
Ecgberht, king of
Kent, and
Oswy, king of Northumbria, for consecration as archbishop. Following Wighard's death, Theodore was chosen by Vitalian upon the recommendation of
Hadrian (later abbot of St. Peter's,
Canterbury). Theodore was consecrated archbishop of Canterbury in Rome on 26 March 668, and sent to England with Hadrian, arriving on 27 May 669. ==Archbishop of Canterbury==