• 1977: Attended Ysgol Dyffryn Teifi.
• 1981: The Welsh group ‘Women for Life on Earth’ marched from Cardiff to Greenham Common to protest.
• 1987: Went to India for six weeks, where she met Mother Theresa, before joining the Campaign for Nuclear Disarmament.
• 1989: Helen joined the Yellow Gate camp at Greenham Common and translated a Greenham publicity pamphlet into Welsh.
• 1989: 5 August – Helen was hit by a passing Police horse box while waiting to cross a road.
• 1989: The death is determined to be accidental. Helen’s was the only death that occurred at Greenham during the peace protests.
• 2000: The Women’s Peace Camp closed on 5 September.
• 2002: A Peace Garden was opened at Greenham Common, including a small garden dedicated to Helen Thomas
• Dafydd Iwan wrote a song entitled ‘Cân i Helen’ (A Song for Helen) in her memory.
• 2019: Helen Thomas was one of five women short-listed for commemoration by the first statue of a named woman in Wales.