• 1772: He published an eulogy for his poetry teacher, Lewis Hopkin, entitled ‘Dagrau yr Awen’ (Tears of the Muse).
• 1773: Edward and his brothers moved to London.
• 1777: He returned to Glamorgan.
• 1787: He was sent to prison in Cardiff.
• 1790: He begins to use the bardic name Iolo Morganwg.
• 1791–95: Edward Williams moved to London again, where he started to explain the doctrines of bardism, and to hold druidical ceremonies on Primrose Hill.
• 1794: Publishes two volumes of English poetry, ‘Poems’ and ‘Lyric and Pastoral’.
• 1796: He was given work under the Board of Agriculture to describe the condition of farmland in Glamorgan and Carmarthenshire.
• He was chosen as one of the editors of ‘The Myvyrian Archaiology of Wales’.
• 1799: He journeyed through North Wales collecting material.
• 1803: Publishes ‘Rheolau a Threfniadau’ (Rules and Arrangements).
• 1819: When the Dyfed Society held an Eisteddfod in Carmarthen, he succeeded in making the Gorsedd an essential part of the event.
‘Iolo sensed the impact that would have on society, and like a true antiquarian, he set out to record as much as he could, including folk tunes.’ – translated from Alawon Gwerin, ‘Iolo Morganwg’, ed. Leila Salisbury (Gymdeithas Alawon Gwerin Cymru 2012), p. 15