in ▁in ▁the ▁chap el ▁cho ir , ▁and ▁unus ually ▁he ▁never ▁was ▁promoted ▁to ▁a ▁higher ▁position . ▁ ▁By ▁ 1 4 6 0 ▁he ▁was ▁a ▁priest , ▁since ▁he ▁was ▁given ▁that ▁title ▁Mess ire ▁in ▁chap el ▁documents . ▁ ▁The ▁long ▁relatively ▁peace ful ▁period ▁at ▁the ▁court ▁under ▁Philip ▁the ▁Good ' s ▁reign ▁ended ▁with ▁Philip ' s ▁death ▁in ▁ 1 4 6 7 , ▁and ▁under ▁his ▁successor ▁Charles ▁the ▁B old , ▁the ▁musical ▁activities ▁of ▁the ▁court ▁were ▁seriously ▁dis rupted ; ▁many ▁of ▁the ▁sing ers ▁and ▁compos ers , ▁including ▁Hay ne ▁van ▁Gh iz eg hem , ▁took ▁part ▁in ▁his ▁many ▁fut ile ▁military ▁campaign s . ▁ ▁Mort on ▁must ▁have ▁known ▁Hay ne ▁rather ▁well , ▁for ▁an ▁anonymous ▁piece ▁surv ives ▁which ▁describes ▁the ▁virt u os ic ▁singing ▁and ▁playing ▁of ▁the ▁two ▁of ▁them ▁together ▁at ▁Camb rai . ▁ ▁Pay ment ▁records ▁for ▁Mort on ▁end ▁in ▁ 1 4 7 6 , ▁and ▁it ▁was ▁long ▁assumed ▁that ▁he ▁died ▁then ; ▁however ▁more ▁recent ▁evidence ▁from ▁the ▁V at ican ▁archive ▁shows ▁that ▁he ▁was ▁alive ▁as ▁late ▁as ▁ 1 4 7 9 , ▁since ▁he ▁res igned ▁a ▁Dutch ▁parish ▁then . ▁ ▁There ▁is ▁a ▁possibility , ▁never ▁established ▁or ▁fully ▁investig ated , ▁that ▁he ▁may ▁be ▁the ▁same ▁Robert ▁Mort on ▁who ▁became ▁Bishop ▁of ▁Wor c ester , ▁and ▁who ▁died ▁in