
- He was taught how to write poetry by his father and grandfather.
- 1907: He won his first Eisteddfod Chair.
- 1910: He was ordained with the name 'Hedd Wyn'.
- 1916: He came second in the Chair competition at the National Eisteddfod.
- 1917: January – He decided to enlist in the Royal Welch Fusiliers, allowing his younger brother to stay at home
- 1917: March – He finished his ‘awdl’ (ode), 'Yr Arwr' (The Hero) at Litherland military camp, posting it to the Birkenhead National Eisteddfod from France.
- 1917: 6 September – He won the competition but had been killed at the battle of Passchendaele in Belgium little more than a month earlier.
- During the chairing ceremony the Chair was covered with a black cloth, and it became known as 'Y Gadair Ddu' (The Black Chair).
- 1918: His volume of poetry, 'Cerddi'r Bugail' (The Shepherd’s Poems) is published.
- Profits from the publication and other subscriptions were used to erect a memorial statue to him in Trawsfynydd.
‘The Welsh have been remembering Hedd Wyn ever since that sad day in 1917 when he was awarded a National Chair for his ode to The Hero. He had already gone to his grave a hero on the fields of Flanders.’ – Translated from Ifor ap Glyn, ‘Canrif yn Cofio’ (Gwasg Carreg Gwalch 2017), p. 5