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| Date | Events at Whithorn | Date | Events in Scotland |
| About 450 - 500 AD |
Christianity reaches Whithorn. Ninian is Bishop of Whithorn. |
563 | Saint Columba arrives on Iona with 12 companions. |
| 730 | Monks from Northumbria found a new monastery at Whithorn. The first recorded pilgrims visit Ninian's tomb. |
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| About 840 | Norse settlers arrive in Whithorn, possibly from the Dublin area. |
843 | Kenneth MacAlpin becomes King of the Picts and Scots. |
| About 950 - 1050 |
Stone carvers at Whithorn create the round-headed crosses seen in the Priory Museum. |
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| 1150 | Whithorn's church is replaced by a new cathedral. |
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| About 1177 | The Premonstratensian Order establishes a priory at Whithorn and acts as the cathedral's staff. |