Territories and Places - G and I.
Gaidil - The Gaels / Old Irish.
Gailenga - Barony of Gallen in Co. Mayo.
Gaill - the Galls mixed Norman, English, Flemish and Welsh.
Gaillim; in; - the Galway River.
Galinga Beg included Glasnevin near Dublin north of the River Liffey .
Galinga Beg / Gallen in Co. Offaly in the north - west of Southern Leinster./ (O Hennessys.)
Garbthrian Connacht; an; - Breifne.
Gascuin; an; - Gascony.
Gerethech / Geirethech; in; - The Yellow River in Co. Leitrim.
Geraltaig - the Fitz Geralds.
Glaislinn Cluana - in Athlone in Co. Roscommon.
Glenn, an; Glin - in the north - west of Co. Limerick. Glenn Coluim Cill - Glencolmkill in the west of Co. Donegal. Glenn Chonn Cadain - Glenconkeine in Ballynascreen in Co. Derry. Glenn Da Du / Dule / Duile - in Oughteragh in Co. Leitrim. Glenn Da Locha - Glendalough in Co. Wicklow. Glenn Eile; - situated to the west of Mulroy Bay in Co. Donegal. Glenn Fathrain - Glendarragh in Kilmacteigue in Co. Sligo. Glenn Finne - Glennfinn in Co. Donegal. Glenn Flesgi - Glenflesk in Co. Kerry. Glenn Gabli - Glengevlin in Co. Cavan. Glenn na Mochart - Glenavoagh in Co. Sligo.
Glinne; na; - The Glens of Co. Antrim. Glinn Sge - Glinsk in Ballynakill in Co. Galway.
Glosetra - Earl of Gloucester.
Gno Bec - The south part of Moycullen in Co. Galway. Gno Mor - the north part of Moycullen in Co. Galway.
Godelb - in Mag Ai in Co. Roscommon.
Goill - See: Gaill.
Goisdelbaig; na; Costellos of Co. Mayo. Grainseach; an; - See: Caislen na Grainsige. Grainsech Srutha; - in Tir Bruin na Sinna in Co. Roscommon.
Granard - Granard in Co. Longford.
Grencha - in Corca Athchlann in Co. Roscommon.
Grian - The River Graney in Co. Clare.
Guirtin na Spideoige - in Fedaro in Co. Leitrim.
Iarthar Connacht - Western Connacht previously the same area as the Diocese of Annaghdown. Iarthar Mide - Western Meath mainly Co. Westmeath. Iarthar Muman - West Munster.
Ichtar Cairpre - northern part of Carbury in Co. Sligo. Ichtar Connacht - The north or Lower Connacht mainly in Co. Sligo.
Ierasolim - Jerusalem.
Ifernach; in; - in Athlone in Co. Roscommon.
Imaire Fata; an t, Cluain Lis Becc. Imaire Uarain - Oran in Co. Roscommon.
Imflech Brocada - Emlagh in Co. Roscommon.
Imlech Ibair - Emily in Co. Tipperary.
Imper Emper - in Kilmacnevin in Co. Westmeath.
Inis Aenaig - Inishheany off the south coast of Clew Bay in Co. Mayo. Inis Bole - Inish Island in Loch Gara in Co. Sligo. Inis Cain - Iniskeen in Loch Melvin in Co. Leitrim. Inis Cain Meic Dega; - Inishkeen in Farney in Co. Monaghan. Inis Clothrann - Inniscloghran in Loch Ree in Co. Roscommon. Inis Crema - Inishcraff in Loch Corrib in Co. Galway. Inis Cua - Inishcoe in Crossmolina in Co. Mayo. Inis Cuan - the winding part of the Black River about a mile west of Rathowen at Moygoish in Co. Westmeath. Inis Doigni - Inishterry in Loch Key in Co. Roscommon. Inis Eogain - Inishowen Peninsula in Co. Donegal. Inis Fraich - Inishfree in Loch Gill in Co. Sligo. Inis Locha Burran - Loughaverra Island in Co. Antrim. Inis Locha Leithinnsi - Loughlynch Island in Co. Antrim. Inis Mac nErin - Church Island in Loch Key in Co. Roscommon. Inis Meodoin - Inishmaine on the south - east of Loch Mask in Co. Mayo. Inis Mor Locha Gamna - Inchmore in Loch Gowna in Co. Longford. Inis Mor (Locha) Gili) - Church Island in Loch Gill in Co. Sligo. Inis na Conniri - O Reilly's Island in Loch Allan in Co. Roscommon. Inis na Torc; - Cherry Island in Garradice Loch in Co. Leitrim. Inis Raithlin - Inishraher in Westport Bay in Co. Mayo. Inis Samair; an island in the River Erne near Ballyshannon in Co. Donegal. Inis Sgellen (Sgeillenn) - Enniskillen in Co. Fermanagh. residence of O Donnell in 1514 AD.
Innsi an Lochain - Loughton Islands in the River Bann near Coleraine in Co. Derry. Innsi Gall - the Hebrides Mc Rory King of in 1318 AD, Mac Donald King of in 1499 AD. Insi Gall Orc - The Orkneys. Insi Meic an Duirn - Inishmacadurn / Rutland Island in Co. Donegal between the south end of Aran Island and the mainland. Inis Mod - Islands in Clew Bay in Co. Mayo. Inis Tuathruis - Near Rosses Point in Sligo Bay.
Insola Sancti Trinetatis - See: Oilen na Trinnoite.
Iorc - York in England - Duke of.
Irrus - Barony of Erris in Co. Mayo. Brian O Dowd / Ua Dubda King of in 1242 AD.
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