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Castlederg, County Tyrone


Ir. Caisleán na Deirge [kashlan na jeriga] ‘castle of the (river) Derg’.


15km SW of Strabane

par: Urney        bar: Omagh East

The ruins of the castle, built c.1610 by Sir John Davies, Attorney General for Ireland, on the site of an earlier castle, are on the north bank of the Derg, in the townland of CASTLESESSAGH. Davies was granted 2,000 acres in this area in 1609 [Caislén na Deircce 1497].


McKay, P. (2007): A Dictionary of Ulster Place-Names, p. 38

Additional Information


Historical name form

Old FormRef. DateReference
O Neill do ghabail Chaisdeil na Dergi1497AU iii 424
Ro gabhadh Caislén na Deircce lais (O/Neill)1497AFM iv 1234
Suidhe fa Chaislén na Deircce [siege, castle taken1505AFM v 1284
suidhe fa Caislen na Derge.. 7an caislen doghabail1505AU iii 474
no find Caislen na Deirge1507AFM v 1292-8
roind do chis Chois-Derge 7 Luirg [O''Neill1527AU iii 564n
gu port na garbharda 7 gu Cois Deirgi1537AU iii 614n
Caislen na Deircce [taken by Niall Garbh O''Donnell1600AFM vi 2226
Castle Dirge1608Sur. Ulst. 156
Cast. Dirgh1610Speed's Ulster
Castlannadergy1610CPR Jas I 164b
Castlederge1619CPR Jas I 429a
Ye ... Towne of Darrage1655cCiv. Surv. p.348
(?)Eastlederg1666HMR Tyr. (2) 254
Caislén na Deirge. Parochialis ecclesia1680cTop. Frag. II [87]
Castel Dearg, skirts of Urney1693Bishop. Der. ii 151 $309
Derg-bridge, village, barony of Omagh1802Stat. Sur. Tyr. (McEvoy) 160
Dergbridge T.1836OSM v 136
Port na Garbharda ""port of the rough heights""1895AU iii 614n
Caisleán na Deirge "" castle on the Derg""1999Cel. Ulst. Tds 6
~Caisleán na Deirge ""castle of the (river) Derg""1999Dict. Ulst. PN 38
Omagh West
Parish in 1851
Place name ID
Place name type