Dennis Coslett (12 September 1939 – 20 May 2004) was a Welsh political activist, best known as a member of the Free Wales Army, who became notorious in 1969.

Many Welsh nationalists became frustrated by the refusal of Plaid Cymru to take a tougher stance on such issues at the time.

[4] Fundamentally, their self-publicity led to their imprisonment, as the police were under pressure to react to protests and threats of violence which preceded the investiture of the Prince of Wales at Caernarfon.

[3] He and Cayo-Evans were each sentenced to 15 months imprisonment, although the case rested on little more than press cuttings, including exaggerated claims which Evans and Coslett had themselves uttered to journalists.

[4] Following his release from prison, Coslett began his new career as a poet, essayist and speaker, publishing two books, Rebel Heart and Patriots and Scoundrels.