ic ▁cl an ▁based ▁in ▁what ▁is ▁today ▁County ▁Ti pper ary ▁and ▁County ▁L imer ick . ▁The ▁cl an ▁claims ▁descent ▁from ▁C ath air ▁M ór ▁of ▁the ▁La igh in , ▁but ▁they ▁first ▁appear ▁in ▁the ▁historical ▁record ▁in ▁the ▁ 1 5 th ▁century ▁in ▁the ▁kingdom ▁of ▁Thom ond . ▁John ▁O ' Don ovan ▁claims ▁they ▁are ▁distinct ▁from ▁the ▁Ryan ▁cl an ▁which ▁ruled ▁U í ▁Dr ón a ▁in ▁what ▁is ▁today ▁County ▁Car low . ▁ ▁N aming ▁convent ions ▁ ▁Over view ▁ ▁This ▁family ▁claim ▁descent ▁from ▁one ▁Ma o il ▁Ri ag há in , ▁who ▁was ▁named ▁in ▁honour ▁of ▁a ▁Saint ▁Ri ag há in . ▁▁ ▁It ▁is ▁first ▁documented ▁as ▁a ▁surname ▁in ▁the ▁ 1 5 th ▁century ▁in ▁east ▁Thom ond / n orth ▁Or mond , ▁where ▁the ▁Ó ▁Ma o il ri ains ▁attacked ▁and ▁disp la ced ▁the ▁ ▁Ó ▁h If ear ná in ▁family . ▁The ▁territory ▁they ▁conquer ed ▁became ▁known ▁as ▁bar ony ▁of ▁O w ney ▁and ▁Ar ra . ▁O w ney ▁derived ▁its ▁name ▁from ▁one ▁U a ith ne ▁Ó ▁Ma o il ri ain . ▁ ▁See ▁also ▁ ▁É am onn ▁an ▁Ch no ic ▁ ▁Mac G orm an ▁— ▁another ▁La igh in ▁cl an ▁of ▁Thom ond ▁ ▁References ▁ ▁Bibli ography ▁ ▁The ▁family ▁of ▁O ' M ul ry an ▁in ▁Spain , ▁W .