* In 1375, the harbour was destroyed by the Earl of Arundel. It would later be rebuilt at its current location, at Kroas Batz.
* From 1522 to 1545–1550, construction the Church of Our Lady of Kroas Batz (see Monuments above).
* In 1548, the six-year-old Mary, Queen of Scots, having been betrothed to the Dauphin François, disembarks at Roscoff.
* In 1790, Roscoff was raised to independent commune. Until this time, the town had effectively depended on Saint-Pol-de-Léon
