▁that ▁law ▁must ▁accord ▁with : ▁f ír ▁( tr uth ) ▁and ▁d lig ed ▁( right ▁or ▁ent it lement ). ▁These ▁two ▁terms ▁occur ▁frequently , ▁though ▁Irish ▁law ▁never ▁strictly ▁defines ▁them . ▁Similarly , ▁the ▁term ▁c ór us ▁( law ▁in ▁accord ance ▁with ▁proper ▁order ) ▁occurs ▁in ▁some ▁places , ▁and ▁even ▁in ▁the ▁titles ▁of ▁certain ▁texts . ▁These ▁were ▁two ▁very ▁real ▁concepts ▁to ▁the ▁jur ists ▁and ▁the ▁value ▁of ▁a ▁given ▁judgment ▁with ▁respect ▁to ▁them ▁was ▁apparently ▁as certain able . ▁Mc Le od ▁has ▁also ▁suggested ▁that ▁most ▁of ▁the ▁specific ▁laws ▁mentioned ▁have ▁passed ▁the ▁test ▁of ▁time ▁and ▁thus ▁their ▁truth ▁has ▁been ▁confirmed , ▁while ▁other ▁prov isions ▁are ▁just ified ▁in ▁other ▁ways ▁because ▁they ▁are ▁younger ▁and ▁have ▁not ▁been ▁tested ▁over ▁time ▁The ▁laws ▁were ▁written ▁in ▁the ▁oldest ▁dialect ▁of ▁the ▁Irish ▁language , ▁called ▁B ér la ▁F é ini ▁[ B air la - f ain a ], ▁which ▁even ▁at ▁the ▁time ▁was ▁so ▁difficult ▁that ▁persons ▁about ▁to ▁become ▁bre h ons ▁had ▁to ▁be ▁spe cially ▁instruct ed ▁in ▁it , ▁the ▁length ▁of ▁time ▁from ▁beginning ▁to ▁becoming ▁a ▁learned ▁Bre hon ▁was ▁usually ▁ 2 0 ▁years . ▁Although ▁under ▁the ▁law ▁any ▁third ▁person ▁could ▁ful fill ▁the ▁duty ▁if ▁both ▁parties ▁agreed , ▁and ▁both ▁were ▁s ane . ▁It ▁has ▁been ▁included ▁in ▁an ▁Eth no - C elt ic ▁break away