216 Proceedings of the Royal Irish Academy. 
I find I was mistaken in my view of the extent of Moy Itha ; it never 
comprised any part of Inishowen — never; it is no other than the 
Lagan, and its situation on ' Lough Foyle' alludes to what modern 
map-makers call River Poyle." He indicates a second error, also, in 
these words : — ''And where Colgan says that ' Tir-enna is a territory 
in Tir-connell, situate hetween two arms of the sea — viz., between 
Lough Poyle and Lough Soolie,' we are to understand by this that 
he meant not Inishowen, which really lies hetween the two Loughs, 
hut the eastern part of the barony of Eaphoe, now called the Lagan 
(formerly Moy Itha), which lies between the arms of Lough Foyle and 
Lough S willy — i.e., between Lifford and Letterkenny, and which was 
bounded on the N.IN'.E. by the peninsula of Inishowen." 
Tir-enna, it is obvious, did '' really lie" between two Loughs, at a 
time (as I point out) when Tipper Lough Eoyle was still in existence, 
and that existence is plainly indicated in the citations given. It is 
further shown in the name of a place called Murlog, near Lifford, as 
the appellation signifies a sea-cove." In the year 1600, Sir Henry 
Dockwra mentioned the name "Lough Eoyle" as being that commonly 
employed. In Queen Elizabeth's Inquisitions, dated Derry, 23rd i^ov., 
an. 1545, mention is made of ''the royalties and fisheries of the lake 
or river called Loghfoile ;" and, again, we have it in the statement that 
' ' the island called Inshcorri, in the river or lake of Loghfoile, near the 
village of Liffer, likewise belongs to the said Queen, as a parcel of the 
possessions of said monastery of (Colum killy), or house of the Canons 
of Derry." 
Eortunately, in the Maps of the Escheated Counties in Ireland, A.D. 
1609,^' there is positive and distinct evidence that the "Lake of Logh- 
foile" was at that date different in size from the present river. It 
was much broader and contained more islands. 
On the modern maps of the Ordnance Survey, the Eiver Eoyle is 
found to be only a quarter of a mile in width, when measured by scale, 
even when the measurement is taken at the greatest divergence of 
its channels, and across two islands, Oilen-more and Oilen-beg, at 
Disert. IN'ow, in a map of the escheated county of Tyrone, and 
drawn to scale, the " Lake of Loghfoile" is laid down at a mile in 
width, and this width is continued for the distance of four or five 
miles below Strabane. The map is carefully set out, for confiscation 
purposes, and there is not much probability of a gross error in these 
dimensions, more especially as this part of the Lough is marked down 
as " The Salmon Eisheries," and would, therefore, be attentively ex- 
amined. Besides, we have a second test, in the number of islands. 
into Magh-Itlia, and across Termon-Daveoo;, until lie reached Lough Erne, w^here 
he committed great depredations and demolished a castle." 
The Head of the Lough, at Strahane and Lifford, was then, in fact, re- 
garded as a seaport. This is evident from the facts mentioned, from the name of 
a place near Lifford, Murlog {cf. Mur-hholg, now Murlough Bay), or sea-cove, and 
from the appellation anciently given to Lifford, Port-na-tri-namhad, afterwards 
Portnatrynod, signifying the " port of the three enemies." 
* Ordnance Survey, Southampton, 1861. 
