Gwynedd

Cunedda Wledig ap Edern “Cunedda the Imperator” c.450–c.460
Einion Yrth ap Cunedda “Einion the Impetuous” c.470–c.480
Owain Ddantgwyn Rhos; late 5th century
Cynlas Goch Rhos & St Einion Llŷn ap Owain late 5th and early 6th century
Cadwallon Lawhir ap Einion “Cadwallon Long Hand” c.500–c.534
Maelgwn Hir ap Cadwallon “Maelgwn the Tall” c.520–c.547
Rhun Hir ap Maelgwn “Rhun the Tall” c.547–c.580
Beli ap Rhun c.580–c.599
Iago ap Beli c.599–c.616
Cadfan ap Iago c.613–c.625
Cadwallon ap Cadfan c.625–634
Cadafael Cadomedd ap Cynfeddw “Cadfael the Battle-Shirker” 634–c.655
Cadwaladr Fendigaid ap Cadwallon “Cadwallader the Blessed” c.655–c.682
Idwal Iwrch ap Cadwaladr “Idwal Roebuck” c.682–c.720
Rhodri Molwynog ap Idwal “Rhodri the Bald and Gray” c.720–c.754
Caradog ap Meirion c.754–c.798
Cynan Dindaethwy ap Rhodri c.798–816
Hywel ap Rhodri Molwynog 814–825
Merfyn Frych ap Gwriad “Merfyn the Freckled” 825–844
Rhodri Mawr ap Merfyn “Rhodri the Great” 844–878
Anarawd ap Rhodri 878–916 establishes the Aberffraw dynasty, the senior branch of descendants from Rhodri Mawr
Idwal Foel ab Anarawd “Idwal the Bald” 916–942
Hywel Dda ap Cadell “Howell the Good” 942–950 Dinefwr dynasty of Rhodri Mawr's descendants usurp from Aberffraw.
Iago ab Idwal 950–979 returns to the Aberffraw branch
Ieuaf ab Idwal 950–969
Hywel ab Ieuaf 974–985
Cadwallon ab Ieuaf 985–986 Maredudd ab Owain 986–999 Dinefwr dynasty seizes Gwynedd
Cynan ap Hywel 999–1005 Returns to the Aberffraw dynasty briefly
Aeddan ap Blegywryd 1005–1018 usurpes Gwynedd from the Aberffraw dynasty
Llywelyn ap Seisyll 1018–1023 cadet branch of Mathrafal dynasty from Powys usurps from Aeddan ap Blegywryd
Iago ab Idwal ap Meurig 1023–1039 Aberffraw dynasty returns
Gruffydd ap Llywelyn 1039–1063 Llywelyn's son Gruffydd usurps from Aberffraw dynasty
Bleddyn ap Cynfyn 1063–1075 Mathrafal dynasty of Powys “receives” Gwynedd from the English King
Trahaearn ap Caradog 1075–1081
Gruffudd ap Cynan 1081–1137 Aberffraw dynasty returns

Prince of the Welsh
Owain Gwynedd ap Gruffydd 1137–1170 first to style himself Princeps Wallensium

Princes of Aberffraw & Lords of Snowdon
Maelgwn ab Owain Gwynedd 1170–1173
Dafydd ab Owain Gwynedd 1170–1195 in the east
Rhodri ab Owain Gwynedd 1170–1190 in the west
Llywelyn Fawr ap Iorwerth “Llywelyn the Great” 1195–1240
Dafydd ap Llywelyn 1240–1246 Used title Prince of Wales from 1244 onwards
Owain Goch ap Gruffydd “Owen the Red” 1246–1255
Llywelyn ap Gruffudd “Llywelyn the Last” 1246–1282 Used title Prince of Wales from 1258 onwards
Dafydd ap Gruffydd 1282–1283 not crowned but claimed the title
Madog ap Llywelyn 1294–1295 not crowned but claimed the title
Owain ap Tomas ap Rhodri “Owen the Red Hand” 1372–1378 in exile but claimed the title

NOTE: saved from online sources as a starting outline only.