President de Valera gives a televised speech at the Glasnevin graveside of Roger Casement

Roger Casement was given a full state funeral following the return of his remains to Ireland in 1965.

At his graveside de Valera remarks that

It required great courage to do what Casement did, and his name would be honoured, not merely here, but by oppressed peoples everywhere, even if he had done nothing for the freedom of our own country.

Roger Casement was given a state funeral and was buried with full military honours in the Republican plot in Glasnevin Cemetery. Although a British diplomat, Casement joined the Irish Volunteers in 1912 and attempted to secure German aid for Irish independence. He was hanged in Pentonville Prison, London in 1916, for treason against the crown.  

The State Funeral of Roger Casement took place on 1 March 1965.