▁the ▁castle . ▁The ▁chief ▁compiler ▁was ▁Man us ▁O ' D u ign an , ▁one ▁of ▁a ▁family ▁who ▁were ▁ol lav s ▁and ▁scri bes ▁to ▁the ▁Mc Don agh ▁and ▁the ▁Mc D erm ots . ▁Other ▁scri bes ▁of ▁the ▁book ▁were ▁Sol omon ▁O ' D rom a , ▁a ▁member ▁of ▁a ▁famous ▁Co . ▁F erman agh ▁family , ▁and ▁a ▁Robert ▁Mc She edy . ▁The ▁book ▁is ▁a ▁compilation ▁of ▁older ▁works , ▁mostly ▁loose ▁manuscript s ▁and ▁valuable ▁documents ▁handed ▁down ▁from ▁anti qu ity ▁that ▁came ▁into ▁possession ▁of ▁Mc Don agh . ▁ ▁The ▁first ▁page ▁of ▁the ▁work ▁contains ▁a ▁drawing ▁of ▁No ah ' s ▁Ark ▁as ▁conce ived ▁by ▁the ▁scri be . ▁The ▁first ▁written ▁page ▁is ▁missing ▁and ▁the ▁second ▁opens ▁with ▁a ▁description ▁of ▁the ▁ages ▁of ▁the ▁world . ▁Patrick ▁and ▁his ▁household ; ▁C orm ac ' s ▁instructions ▁to ▁a ▁king ; ▁and ▁a ▁physical ▁and ▁ge ological ▁survey ▁of ▁Ireland . ▁Part ▁of ▁the ▁work ▁is ▁devoted ▁to ▁the ▁sag as ▁of ▁Finn ▁and ▁Brian ▁Bor u , ▁and ▁the ▁Leb or ▁na ▁Cert ▁( Book ▁of ▁Rights ). ▁It ▁also ▁contains ▁treat ises ▁on ▁met re ▁and ▁the ▁profession ▁of ▁a ▁poet , ▁and ▁on ▁the ▁Og ham ▁writing ▁and ▁language . ▁The ▁book ▁ends ▁with ▁several ▁transl ations ▁from ▁the ▁Greek : ▁the ▁destruction ▁of ▁T roy ▁and ▁the ▁w ander ings ▁of ▁U ly ss es ,