IAGO ab IDWAL ap MEURIG (d. 1039 ), king of Gwynedd
IAGO ab IDWAL FOEL ( fl. 942-979 ).
IDWAL ap MEURIG (d. 996 ),
IDWAL FOEL (‘ the Bald ’ d. 942 ), king of Gwynedd
IESTYN ap GWRGANT ( fl. c. 1081-1093 ), last independent ruler of Glamorgan
IEUAF (or IDWAL) ab IDWAL FOEL (d. 985 ), joint king of Gwynedd .
IEUAN ap BEDO GWYN, or IEUAN BEDO GWYN ( fl. c. 1530-1590? ), poet
IEUAN ap GRUFFUDD LEIAF ( fl. latter half of 15th cent. ), poet
IEUAN ap HUW CAE LLWYD ( fl. 1475-1500 ), one of the minor poets of the 15th cent.
IEUAN ap HYWEL SWRDWAL ( fl. 1430-1480 ), poet ,
IEUAN ap IEUAN ap MADOG ( fl. 1547-1587 ), scribe .
IEUAN ap LLYWELYN FYCHAN (d. 1532 ), poet
IEUAN ap MADOG ap DAFYDD ( fl. c. 1500 ), poet
IEUAN ap RHYDDERCH ap IEUAN LLWYD ( fl. 1430-1470 ), gentleman and poet , of Cardiganshire ,
IEUAN ap RHYS ap LLYWELYN ( fl. beginning of 16th cent. ), a poet concerning whom no details remain.
IEUAN ap TUDUR PENLLYN ( fl. c. 1480 ), poet ,
IEUAN BRECHFA [ c. 1430 - 1500 ], poet and genealogist
IEUAN CLYWEDOG ( fl. 1577-1596 ), poet
IEUAN DDU ap DAFYDD ab OWAIN ( Ieuan Dafydd Ddu , Ieuan Dafydd ab Owain ) ( fl. c. 1440-1480 ), a poet of Glamorgan .
IEUAN DEULWYN ( fl. c. 1460 ), poet ,
IEUAN DRWCH Y DARAN ( fl. c. 1370-1400? ), poet .
IEUAN DU'R BILWG ( fl. c. 1470 ), poet
IEUAN DYFI ( 1461? - 1500 ) .
IEUAN FYCHAN ap IEUAN ab ADDA (d. c. 1458 ), poet ,
IEUAN GETHIN ap IEUAN ap LLEISION ( fl. c. 1450 ), poet and gentleman , of Baglan, Glam. ,
IEUAN GYFANNEDD ( fl. 1570-1600? ), poet
IEUAN (IFAN) ap SION ( fl. c. 1612-1636 ), poet .
IEUAN (IFAN) DYLYNIWR ( fl. 1520-1567 ), harpist and bard .
IEUAN (IFAN) o GARNO (Syr) ( fl. c. 1530-1570 ), poet and cleric , of Carno, Mont.
IEUAN LLAFAR ( fl. c. 1594-1610 ), poet ,
IEUAN LLWYD ab Y GARGAM ( 14th cent. ), a poet ,
IEUAN LLWYD BRYDYDD ( fl. c. 1460-1490 ), a poet ,
IEUAN LLWYD SIEFFRAI ( fl. c. 1599-1619 ), poet ,
IEUAN MON (or IEUAN MON HEN ) ( fl. c. 1460-1480 ), poet ,
IEUAN RHAEADR ( fl. c. 1480), poet ,
IEUAN RUDD ( fl. 1470 ), a Glamorgan bard
IEUAN TUDUR OWEN ( fl. c. 1627 ), a poet
ILLTUD ( c. 475 - c. 525 ) a Celtic saint and one of the founders of monachism in Britain .
INCO BRYDYDD ( fl. c. 1480 ), poet .
INGRAM, JAMES (d. 1788 ), Methodist exhorter, and afterwards Independent minister
INNES, JAMES DICKSON ( 1887 - 1914 ), artist
INNES, JOHN ( 1853? - 1923 ), accountant and antiquary
IOCYN DDU ab ITHEL GRACH ( fl. c. 1380 ), poet .
IOLO GOCH ( c. 1320 - c. 1398 ), poet ,
IORWERTH (or GERVASE ) , abbot of Talley and bishop of S. Davids ,( 1215-1229 ).
IORWERTH ab Y CYRIOG ( fl. c. 1380 ), poet ,
IORWERTH ap BLEDDYN (d. 1111 ) ,
IORWERTH ap MADOG ( fl. 1240?-1268? ), jurist ,
IORWERTH BELI , a poet who sang in Gwynedd early in the 14th cent.
IORWERTH DRWYNDWN ( The Flat-nosed ) (d. probably c. 1174 ),
IORWERTH FYCHAN ap IORWERTH ap ROTPERT ( fl. c. 1300 ), poet
IORWERTH FYNGLWYD ( fl. c. 1480-1527 ), bard ,
IRBY, GEORGE FLORANCE, 6th Baron BOSTON ( 1860 - 1941 ), landowner and scientist
ISAAC, DAVID LLOYD ( 1818 - 1876 ), cleric and author
ISAAC, EVAN ( 1865 - 1938 ), Wesleyan minister
ISFAEL ( ISHMAEL ) ( fl. 6th cent. ), saint .
ITHEL ap RHOTPERT or ROBERT ( fl. 1357-1382 ), archdeacon ,
ITHEL DDU ( fl. second half of 14th cent. )
