- RHISIART ap ROBERT Nantlle, Plas Newydd - see GLYN
- RHISIART DDU O WYNEDD - see EDWARDS, RICHARD FOULKES
- RHISIART FYNGLWYD (fl. 1510-1570), poet
- RHISIART GRUFFUDD ap HUW - see GRUFFUDD, RHISIART
- Rhisiart Iorwerth - see RHISIART FYNGLWYD
- RHISIART O FADOG - see HUMPHREYS, RICHARD GRIFFITH
- RHISIART OWEN (ap RHISIART) (fl. c. 1622) Y Lasynys,, poet
- RHISIERDYN (fl. latter half of the 14th century) Gwynedd, poet
- RHIWALLON ap CYNFYN (d. 1070), king of Powys
- RHOBERT AP DAFYDD LLWYD (fl. c. 1550-1590), poet
- RHOBERT LEIAF, poet - see IEUAN ap GRUFFUDD LEIAF
- RHOBERT RHAGAT - see HUMPHREYS, ROBERT
- RHODRI ab OWAIN (d. 1195), prince of Gwynedd
- RHODRI ap GRUFFYDD (d. c. 1315), prince of Gwynedd
- RHODRI MAWR (d. 877), king of Gwynedd, Powys, and Deheubarth
- RHODRI MOLWYNOG (d. 754), king of Gwynedd
- RHONDDA, 1st Viscount - see THOMAS, DAVID ALFRED
- RHONDDA, 2nd Viscountess - see THOMAS, MARGARET HAIG
- RHOSYNNOG - see MORRIS, WILLIAM
- RHOSYR - see ROBERTS, ROBERT SILYN
- RHUDDENFAB - see JONES, LEWIS
- RHUDDWAWR - see DAVIES, JOHN EVAN
- RHUFAWN - see JONES, THOMAS GWYNN
- RHUN ap MAELGWN GWYNEDD (fl. 550), ruler of north-west Wales
- RHYDDERCH AB IEUAN LLWYD (c. 1325 - before 1399?), lawman and literary patron
- RHYDDERCH HAEL (or HEN), king of Alclyde (Dumbarton, near Glasgow)
- RHYDDERCH HAEL - see MILLS, RICHARD
- RHYDDERCH HEN - see RHYDDERCH HAEL
- RHYDDERCH, JOHN - see RODERICK, JOHN
- RHYDDERCH, SION - see RODERICK, JOHN
- RHYGYFARCH (1056/7 - 1099)
- RHYL of HOLYWELL, Baron - see BIRCH, EVELYN NIGEL CHETWODE
- RHYS family, rhymesters and minstrels
- RHYS ab OWAIN ab EDWIN (d. 1078), king of Deheubarth
- RHYS ap DAFYDD LLWYD (d. 1469), governor of Montgomery castle - see DAFYDD LLWYD
- RHYS ap GRUFFYDD (Yr Arglwydd Rhys, The lord Rhys), (1132 - 1197), lord of Deheubarth
- RHYS ap GRUFFYDD (d. 1356), nobleman
- RHYS ap GRUFFYDD Sir (d. 1531) - see RICE
- RHYS ap HARRI o EUAS (fl. mid 16th century?), poet
- RHYS ap MAREDUDD (d. 1292), lord of Dryslwyn in Ystrad Tywi
- RHYS ap MEREDYDD (fl. during Henry VII's reign), military leader - see PRICE
- RHYS AP TEWDWR (d. 1093), king of Deheubarth (1078-1093)
- RHYS ap TEWDWR (d. 1093)
- RHYS ap THOMAS Sir (1449 - 1525), chief Welsh supporter of Henry VII
- RHYS BRYCHAN (fl. c. 1500), poet
- RHYS CAIN (d. 1614), herald bard
- RHYS DEGANWY (fl. c. 1480), a poet
- RHYS DYFED - see REES, REES ARTHUR
- RHYS FARDD (fl. c. 1460-1480), a vaticinatory poet
- RHYS FAWR (fl. during Henry VII's reign), military leader - see PRICE