▁of ▁Ireland ), ▁is ▁a ▁book ▁written ▁in ▁or ▁about ▁the ▁ 1 3 4 0 s ▁by ▁Ad ham h ▁Ó ▁C ian á in ▁by ▁and ▁for ▁himself , ▁and ▁out ▁of ▁the ▁book ▁of ▁his ▁teacher , ▁Se án ▁M ór ▁Ó ▁Dub h ag á in . ▁▁ ▁Kenneth ▁Nich oll s ▁has ▁suggested ▁that ▁Ad ham h ▁wrote ▁the ▁book ' s ▁gene alog ies ▁between ▁ 1 3 2 8 ▁and ▁ 1 3 5 0 , ▁which ▁occur ▁in ▁the ▁first ▁half ▁of ▁the ▁manuscript , ▁which ▁also ▁contains ▁the ▁met rical ▁B ans hen chas . ▁It ▁is ▁also ▁important ▁as ▁the ▁earliest ▁surv iving ▁post - N orm an ▁G ael ic ▁gene al ogy , ▁which ▁Ó ▁C ian á in ▁- ▁as ▁he ▁implies ▁himself ▁- ▁probably ▁derived ▁from ▁Ó ▁Dub h ag á in ' s ▁book . ▁ ▁Un us ually ▁for ▁a ▁late ▁medieval ▁Irish ▁manuscript , ▁it ▁is ▁illustrated , ▁including ▁human ▁port ra its . ▁It ▁is ▁believed ▁to ▁have ▁been ▁part ▁of ▁a ▁movement ▁to ▁rev iv ify ▁Irish ▁culture ▁by ▁anti qu ar ism . ▁ ▁S ources ▁▁ ▁The ▁Lear ned ▁Family ▁of ▁Ó ▁C ian á in / Ke en an , ▁by ▁N ol la ig ▁Ó ▁M ura í le , ▁in ▁Cl ough er ▁Record , ▁pp .   3 9 6 – 4 0 2 , ▁ 2 0 0 5 . ▁ ▁Category : I r ish ▁manuscript