us ▁san ct i ". ▁That ▁on ▁the ▁left ▁is ▁decor ated ▁with ▁car v ings ▁of ▁fro gs , ▁l iz ards ▁and ▁e els . ▁ ▁Also ▁in ▁this ▁area ▁is ▁a ▁s arc oph ag us ▁thought ▁to ▁date ▁back ▁to ▁the ▁ 1 1 th ▁century ▁and ▁believed ▁by ▁some ▁histor ians ▁to ▁be ▁the ▁grave ▁of ▁Con an ▁Mer i ad oc ▁the ▁first ▁Christian ▁king ▁of ▁Brit t any . ▁This ▁s arc oph ag us ▁is ▁ 2 . 3 4 ▁metres ▁in ▁length ▁and ▁is ▁decor ated ▁with ▁many ▁car v ings ▁including ▁that ▁of ▁a ▁tree ▁without ▁leaves ▁a ▁traditional ▁image ▁of ▁death . ▁ ▁The ▁south ▁nave ▁ ▁The ▁bapt ister y ▁and ▁st ained ▁glass ▁window ▁entitled ▁ ▁" Les ▁ œuvres ▁de ▁mis éric orde " ▁▁ ▁The ▁c athedral ▁has ▁a ▁bapt ister y ▁car ved ▁from ▁o ak ▁located ▁to ▁the ▁right ▁of ▁the ▁south ▁por ch ▁entrance . ▁It ▁was ▁the ▁work ▁of ▁the ▁studio ▁of ▁Der rien - P ond aven ▁based ▁in ▁Saint - Pol - de - L éon ▁and ▁dates ▁to ▁ 1 8 9 7 . ▁This ▁area ▁of ▁the ▁c athedral ▁was ▁at ▁one ▁time ▁the ▁chap el ▁of ▁Saint ▁Martin ▁and ▁originally ▁Mon se igneur ▁de ▁K ers au zon ' s ▁tomb ▁was ▁located ▁here ▁until ▁moved ▁to ▁the ▁cho ir ▁area . ▁ ▁The ▁font ▁itself ▁is ▁car ved ▁from ▁gran ite . ▁The ▁Saint ▁Martin ▁chap el ▁has