1200
- 1214 - Battle of Bouvines confirms French crown's sovereignty over the duchy of Normandy's lands in Brittany and Normandy, meaning Cornwall and Brittany are once more in separate states.
- 1235-1237 - Cornish militia fight against the Scots
- 1265 Work starts on the Lostwithiel Stannary Palace. It is reputed to be the oldest non-ecclesiastical building in Cornwall and was said to have been built as a replica of the Great Hall of Westminster. Its original function was as a Court dealing with the Cornish tin industry.
- 1265 Glasney College was founded at Penryn.
- c 1280 - The Hereford Mappa Mundi highlights Cornwall.
Read more about this topic: Timeline Of Cornish History