1991 - Byron Rogers wrote an article about Gwenllian in The Guardian.

1993 - Captain Richard Turner, having read the article, set up a memorial to Gwenllian at Sempringham.

1996 - The Society was founded to look after the memorial and to keep alive Gwenllian's memory.

1998 - The Society's first AGM was held at Garth Celyn near Bangor, Gwenllian's birthplace.

1999 - In a telephone poll the Daily Mirror asked "Should the day of Gwenllian's death become a national holiday?" 96% answered "Yes".

2000 - The memorial at Sempringham was vandalised.

2001 - A new, larger memorial was set up to her in Sempringham.

2008 - An inscribed stone in honour of Gwenllian was set up at Snowdon summit.