Anastasii Sinaitæ, patriachæ antiocheni Οδηγός, seu dux viæ, adversus acephalos [...]

Anastasius the Sinaitic is a saint of the Orthodox Church who lived in the sixth and early seventh centuries.

His life is very poorly known, so it is very difficult to date his period exactly. We know that he was already less at Mount Sinai before 641 because in the chapters of his work, Ὁδηγός or Hodegos, he is shown polemicizing with monophysites in Alexandria under the Byzantine administration. He is known to be still active during the pontificate of the Monophysite patriarch John III (681-689) through two festal letters written in 686 and 689. The most likely explanation is that he was born around 615/620 and died shortly after 700. He lived at a time when the existence of the Melkite Church in Egypt was very precarious (no resident patriarch of Alexandria for a century after the Muslim conquest in 641).

Thaoudourous Abou Qurrah (c. 750-c. 820), bishop of Harran, was a Melchite Christian theologian of Arabic language and Greco-Roman culture who lived during the early period of Islam. He is known in ancient publications as Aboucara or Abu Kurra.

Theodore Abu Qurrah came from upper Mesopotamia where the population was varied: pagans, Jews, Muslims, Manicheans and Christians of all communities lived side by side. In fact, the Christians were divided into several doctrinally opposed groups: Nestorians, Jacobites, and those whom the latter called "Melkites" (a term that means "imperial"), because they received the definitions of the Council of Chalcedon convened at the request of the emperor Marcian; they were also called Chalcedonians. Theodore was a Chalcedonian.