Great start. If this timeline is meant for a particular Western audience, it seems to me that you should have some information on how/when Orthodoxy started to affect that audience. For example, in North America, the arrival of the first missions and the establishment of (take your pick: OCA, SCOBA and/or the EA) would be useful. Similarly, in the United States, the admission of the Evangelical Orthodox Church into Holy Orthodoxy was a seminal event, as was the reconciliation of ROCOR with the MP. World-wide, recommend showing the existence/establishment of our several churches. Also, the independence of Greece from the Ottoman Empire was a crucial event. However, your timeline does not include neither the establishment of the Ottoman Empire (with the subsequent naming of the Patriarch of Constantinople as the Etnarch for all non-Armenian Christians), nor the independence of Romania, Serbia, and Bulgaria.