Tlachtga and Mogh Ruith
Version 1
Kilbride MS 3, Advocates' Library, Edinburgh

a. Tlachtga can as ro hoinmniged. n� annsa. Tlachtga ingen moga Roith fordosreiblengadar tr� meic S�m�in druad dia luid le [a] hathair do foglaim druidechta in airther in betha. fo deig is � dor�ine [ms. doroighne] in roth r�mach do Thriun ocus in lia i Forchartha ocus in coire i Cn�mchoill. t�rn�i iaram anair ocus in dede sin l� go torracht telaigh Tlachtga. fordoslamnadh ann sin iarum go mberdais tr� macu. i. Dorib diat� magh nDoirbi. ocus Cuma diat� mag Cuma. ocus Muach diat� mag Muich. i c�in dana beid an anmann sin i cuimni fer nEirenn n� thora d�gal nechtrann dochum nEirenn. ocus atbath dia hassaidh ocus is uirri dorinnedh in d�n . unde Tlachta. Tlachtga ingen Mogha m�ir . rosleblengadar meic S�m�in ; �'n nuair th�nic dar muir mas . is di at� Tlachtga taebghlas

b. Moghruith .i. Roth mac Righuill ronalt is de ba mogh Ruith. n� mogh roth .i. magus rotarum [ms. rotharam] .i. is a rothaib dogn�dh a thaisceladh

c. Mogruith mac Cinisc meic Fhirdechet .m. Forgib .m. Firglain .m. Fh�rfhalaid .m. Chaeir .m. Fergusa .m. R�ig .m. Rosa .m. Rudraige

d. Cacht ingen Chatmainn ben eile d'Fergus m�thair Mogaruith meic Fergusa ocus Roth mac Riguill rsnalt. D�r ocus Droigen m�thair d� mac Mogaruith .i. Buan ocus Fercorb ocus m�thair Chairbri lifechair

Translations:
Tlachtgha whence named? Moghruith [the wizard's] d. Tlachtgha, whom (when with her father she went to study magic in the eastern world) Simon Magus's sons all three had to wife, even she it was that for Tr�n constructed the roth r�mhach, the flagstone that is Forchartha, and the cauldron in Cn�mchoill. Then she, bringing with her these two last, returned out ff the E. and reached [the present] tulach Tlachtgha; here she lay in and three sons were born : Dorib, a quo m�gh nDoirbi; Cuma, a quo m�gh gCuma; Muach, a quo m�gh Muaich; so long as which names subsist in the men of Erin's memory, vengeance of outside strangers shall not attain Ireland. She died in childbed and over her the d�n was erected, hense Tlachtgha.

b.) Moghruith : either it was Roth mac Rigoll that fostered him, whense magh Ruith "Roth's slave"; or else mogh roth = "magus rotarum," because it was by "wheel-incantation" that he used to make his observations [do his divination]

c.) Moghruith mac Cuinesc's pedigree in six generations to Fergus mac Roich's (or mac Rosa's') s. Ciar : LL.326:5

d.) Cacht, d. of Cahtmann, and another w. to Fergus, was m. of Moghruith mac Fergus; 'twas Roth mac Rigoll that reared him. D�rdroighen was m. of Moghruith's two suons Buan and Fercorb, and m. of Cairbre lifechair.

SOURCE:
Silva Gadelica. trans. and ed. by Standish O'Grady. p 511, III. p48.