Hi Vince,
I'm really enjoying your "Second Millennium" thread but it's been a while since I've had time to really study it and update my notebook! A few thoughts and things you might want to include:
1387
Keep in mind that the Nestorian church was connected to the fourth century heresy, but didn't fully embrace it. (And I loved that bit about Richard II. Magna Charta + 172 years!)
1389
Is "carnality" the word you're after in paragraph 1?
1401
While on the subject of reformers, John Huss was ordained a priest in 1401
Somewhere in this decade the Medici bank begins gathering real power in Florence.
1409
I have a note about the Council of Pisa, that must the name for the group that appointed Alexander V.
1410
One more important thing about John XXIII. He was financed and supported by the Medici.
Poland conquered West Prussia in 1410.
I have an undated (between 1410 and 1415) that Antipope John XXIII placed Prague under interdict because of John Huss. That was a problem in the middle ages, it meant no baptisms, no marriages, no burials.
1415
If you haven't seen the 1990? movie version of Shakespeare's Henry V, you should. I love it.
BTW, I'm descended from some of those particular nobles that needed executed before the Battle of Agincourt.
1417
This is purely opinion, but I think the reformers did as much to end the Great Schism as the Council of Constance did. The reformers gave the Catholic hierarchy a common enemy, so they didn't have as much time to fight with each other.
1418
The first edition of Thomas A Kempis' "The Imitation of Christ" was published in 1418. It is one of the most published books, under the Bible, and was one of the first devotionals.
1421
However, I would not thoroughly discredit this idea, I have read some authors arguing that Chinese wreckage/stoneware has been found in the area. I suspect DNA tests from some natives would be the only good way to find out, though.
1422
Now it gets complicated. Nine month old Henry VI is declared King of England and France. But the uncrowned Dauphin, is declared Charles VII, King of France.
Ignoring their peace treaty, France and England continue the Hundred Years War, with England capturing another major French city.
Henry V's idea of marrying a French princess and letting their children inherit the throne would have worked very well if he had lived longer. Dying in 1422, he left the French king still alive (The Treaty of Troyes had assumed Henry V would die after the French king) and his son too young to fight. Oh, well...
God bless you,
Grace