Born in Cardiff,[1] Millward studied at Cathays High School there and then the University College of South Wales, before becoming a lecturer.
[3] He married Silvia Hart, with whom he had two children: Llio, an actress and singer, and Andras, an author and martial arts trainer, who died in October 2016.
[5] Millward also served as Plaid's spokesperson on water policy in which role he advocated non-violent direct action against the construction of new reservoirs.
[6] In 1976, he was libelled by Willie Hamilton, who claimed that he had been involved in terrorist activities while he tutored Charles; he received £1,000 in a settlement.
[10] He was played by Mark Lewis Jones in the Netflix series The Crown where he is shown teaching the Prince of Wales Welsh.