I am personally very fond of certain Syriac Christians --- St. Ephrem in particular. There is a book by Sebastian Brock called The Luminous Eye which is a great book about St. Ephrem's poetic theology.
The founding of monasticism -- St. Anthony the Great of Egypt and St. Pachomius. The writings of St. Gregory of Nyssa. St. John Chrysostom's homilies on the epistles of St. Paul. There is a book by Timothy Ware (now Bishop Kallistos Ware) called The Orthodox Church which is well regarded as a historical overview.
I do hope you delve into the early Eastern church -- it's a treasure beyond measure.
Sorry I can't be of more constructive help. Just go back a thousand years and turn right -- can't miss it! :-)