Medieval Timeline - Browse by Region

Pelagian Controversy Begins
Date: 411 A.D.
Description:
Lasting until the year 418, Pelagianism was a heresy asserting that man could attain salvation by the exercise of his own free will, without the help of divine grace. Pelagius (c.360-c.420) a Welsh (or Irish) monk started the heresy. His doctrines were attacked by St. Jerome and St. Augustine of Hippo. Augustine formulated the doctrine of divine grace partly in opposition to Pelagius' teachings.

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St. Patrick's Return to Ireland
Date: c. 433 A.D.
Description:
St Patrick (The Patron Saint of Ireland) returned to Ireland with a missionary party circa 433.

As a boy Patrick had been captured by Irish raiders from a Romano-British family and taken to Northern Ireland as a slave. After six years he escaped to the continent where he trained as a priest, and finally as a Bishop. He brought the Roman Church to Ireland.

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Bangor Abbey Founded
Date: 560 A.D.
Description:
The Abbey at Bangor in Ireland is founded.

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Foundation of Dublin
Date: c. 840 A.D.
Description:
The Danes found the towns of Dublin and Limerick in Ireland.

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Dermot MacMurrough Expelled from Ireland
Date: 1166 A.D.
Description:
Rory O'Connor, the High King of Ireland, expels Dermot MacMurrough, King of Leinster, from Ireland. Dermot would return in 1170 with a force of Normans and Welsh mercenaries which would ultimately result in the establishment of Anglo-Norman rule over much of Ireland.

See the Medieval Wiki for more details.

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Conquest of Ulster
Date: 1177 A.D.
Description:
A discontented Norman knight, Sir John de Courcy left Dublin with a small force of about 300 men-at-arms to conquer the region of Antrim and Down in Ulster, Northern Ireland. After subduing the local Irish chieftains, de Courcy would commence establishing his own independent kingdom in the region. During the reign of Henry II, he seems to have been left alone to enjoy his independence (particularly as his father-in-law was the Norse King of the Isle of Man), and during this time he established the city of Belfast and established numerous castles and churches. In 1185 he was appointed by Henry to the powerful position of Justiciar of Ireland, but later refused to submit to King John and was ultimately defeated by a Royal force led by Sir Hugh de Lacy. De Lacy was rewarded by King John with the title of Earl of Ulster. De Courcy's later life is shrouded in much myth and legend, and he is thought to have died c. 1219.

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