Before addressing specific thinkers or traditions here are one or two key thinkers for all such as St Severus of Antioch
and St Jacob of Serugh, who formed the Post-Chalcedonian Basis of
Christology and Theology but Each has its own thinkers:
Due to the dependency of a Abune being appointed by Alexandria,
lacked a strong Theological movement in the middle ages. It was only in
the middle ages that they had a sufficient number of Priests to serve
the nation and only at the request of the Ethiopian Emperor himself.
Some of the key figures in the Tewahedo Church during the middle ages
were Saint Tekle Haymanot and Iyasus Moa who are both amongst the
Fathers of Monasticism in the Ethipoian Community and lived by the rule
of St Pachomius.
A key Theological writer in the Ethiopian Community is Samuel of
Dabra Wagag. As with the others, it is mainly his life which is
preserved though in books such as “The Acts of Samuel of Samuel of Dabra
Wagag” some of his teachings are preserved.
It was only really when the Franj tried to convert the Ethiopians to
the Latin faith that Ethiopian Philosophy and Theological Education
became a key aspect, since they needed to defend their faith against the
ongoing attempts of Jesuits and others. One key Thinker in the 17th
Century whose writings remain is Zera Yacob. His Treatises give an idea
of the Progress of Ethiopian Philosophy and Theology after the middle
ages.
The Coptic Church had many Golden ages and dry spells in the Middle
Ages, all dependent on which Dynasty ruled Egypt and which foreign
invader was attacking.
Most Medieval Coptic writing is Apologetic, and aimd at explaining
the faith to the islamic community and especialy the Islamic
Philosophers and Theologians of the Era. This led to a vast Arabic
Christian Golden Age.
Some of the Great thinkers of the time include Ibn Kabar, the 4 Sons
of Al-Assal and Yayha Ibn Ali, all of whom wrote vastly explaining
Christian life, the Nature of God and the Nature of the Church.
Yahya Ibn Ali is the Earliest of these (10th C) and wrote apologetic
texts on the Nature of God, refuting many Greek philosophical stances.
He is more commonly associated with the Syriac Church as he was based in
Baghdad though his writing was more of an influence on the Coptic
Church due to its Arabic language.
His most important Theological works are on the Incarnation and his
linguistic commentaries on the Gospels, which are extremely in depth as
both studies of Christian Etymology and Theology.
The Al-Assal brothers are probably the most influencial medieval
Coptic writers, ecpecially Abul Fada’il ibn Al-Assal, who is my
favourite Coptic Medieval Thinker (Since the Canons are my field of
study). Abul Fada’il ibn Al-Assal wrote the Nomocanon which in the
Ethiopian Tewahedo tradition is called the ‘Fetha Negast’ or ‘Law of the
Kings.’ It compiles the Canons of the fathers, Medieval Patriarchal
Canons and Conciliar Canons into the text which was used as a guide for
the Church until very Recently. His works are still widely used in the
Ethiopian Tradition which uses the Fetha Negast as its key text in Canon
Law.
Abu l-Barakat Ibn Kabar is a third recommended thinker in the Coptic
Church. He wrote extensively on Liturgical and ritual life in the Coptic
Church with his text ‘The lamp in the darkness’, a guide for the
Diaconate in the Liturgy, still being regarded as an important reference
for those studying the Liturgy.
Much of the time there was a lack of initiative in the Church to
write much other than Apologetics. The key points for Coptic writings
tend to fall at the start of the Arab rule (due to being free from
Byzantine persecution), the Ayyubid Sultanate (as Salah-ud-din’s
successors were respectful) and the Ottoman ocupation (as the Mamluk
persecution had ended.)
The Syriac Theological Schools remained strong Throughout the Middle
Ages. Two thinkers that I recommend to any Orthodox Theologian are Jacob
Bar-Salibi and Bar-Hebraus, both from Malatia.
Jacob Bar Salibi is one of the most well known Oriental Orthodox
Theologians and quotes the fathers extensively in his works. His most
famous pieces are his Biblical Commentaries.
He also wrote many
anti-Heretical treatises. I would recommend his piece “Against the
Melchites” to any Byzantine Christian as it explains the divergence of
Tradition between EO and OO during these times and gives a good Orental
perspective on the issues.
Bar Hebraeus is one of my favourite Theological Thinkers of the Era
(along with Abul Fada’il ibn Al-Assal) was a Theologian and the
Catholicos of the Syriac Church. he wrote extensively on Theology as
well as Scientific texts. Of all his texts, the most Fascinating is the
Chronicon Ecclesiasticum, which is a history of the world.
One of his key texts is the “Lamp of the Sanctuary” which is
unbublished but has viewable copy in the British library if requested.
Most of his Theological views state that the Chalcedonian and
Non-Chalcedonian communities have no major Dogmatic differences,
something that has been supported by Antiochian and Syriac Orthodox
heirarchs to this day.