Llywelyn ap Gruffudd
- 1247: Signed the Treaty of Woodstock with Henry III.
- 1255: He achieved victory over his older brother, Owen, and younger brother, Dafydd, at the Battle of Bryn Derwin.
- 1256–67: He had an unbroken series of victories in regional battles.
- 1258: The other Welsh Princes apart from one transferred their allegiance from the King of England to Llywelyn when he declared himself Prince of Wales.
- 1267: The Treaty of Montgomery.
- 1267–77: There was a change in the situation during this decade so that the relationship with England was now more focused on south-east Wales.
- 1275: Llywelyn was due to marry Eleanor de Montfort, but the wedding was postponed because Edward I had kept her prisoner at Windsor.
- 1277: He waged war against Edward I. After the Treaty of Aberconwy, he only retained Gwynedd to the west of the river Conwy.
- 1278: He married Eleanor de Montfort.
- 1282: Eleanor died giving birth to her daughter, Gwenllian.
- 1282: Llywelyn was killed in a battle at Cilmeri by Edward I’s soldiers.
Llywelyn subsequently refused to pay homage to Edward I on the grounds that his life would be under threat should he do so. He also decided to marry Eleanor de Montfort to fulfil his promise to her father, but she was captured on her way to Wales and held at Windsor Castle by Edward.’ – ‘Llywelyn ap Gruffudd’, Owain Glyn Dŵr Society – https://www.owain-glyndwr.wales/age_of_the_princes/llywelyn_ap_gruffudd.html