He later moved to Aberystwyth where he married Mary Prudence Rhys (née Hughes) in 1928, where they then lived for the rest of his life.
[2][1] His poem "Atgof" ('Memory') won the National Eisteddfod in Pontypool in 1924, although it was controversial due to its homosexual content.
It has been speculated that it could be about Morris T. Williams, a close male acquaintance of Prosser Rhys who at the time was married to Kate Roberts.
[5] On Mynydd Bach there is a monument to Prosser Rhys and three other notable poets from local villages who competed at the National Eisteddfod: T. Hughes Jones (1895–1966), B. T. Hopkins (1897–1981) and J. M. Edwards (1903–1978).
[9] Prosser Rhys' archives of personal papers are held at the National Library of Wales.