Marion was born in Birkenhead, Cheshire, of Welsh parents, but was brought up at Dolgellau from the age of 4, where she attended Dr Williams's School. A talented musician (she played the harp and piano), she graduated from Guildhall College, London.
Marion worked as a librarian in Dolgellau then at Aberystwyth University before becoming a radio producer with the BBC in Cardiff. She was an early scriptwriter for the long running Welsh soap Pobol Y Cwm and was also for a time a regional organizer for Plaid Cymru. In 1955 she married Quaker journalist Griffith Williams.
A follow on novel was Y Rhiandir Mwyn ("The Fair Wilderness"). Her autobiography was published in 1995.
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