▁ 1 4 9 7 . ▁ ▁Ev idence ▁for ▁this ▁connection ▁includes ▁the ▁complete ▁lack ▁of ▁documentation ▁for ▁the ▁bishop ▁between ▁ 1 4 5 6 ▁and ▁ 1 4 7 6 , ▁when ▁Mort on ▁was ▁active ▁in ▁the ▁Burg und ian ▁court , ▁and ▁the ▁presence ▁of ▁Card inal ▁John ▁Mort on , ▁uncle ▁of ▁the ▁future ▁bishop , ▁in ▁Burg und y ▁at ▁exactly ▁the ▁time ▁when ▁Robert ▁disapp ears ▁from ▁the ▁payment ▁roll s . ▁ ▁Music ▁Given ▁the ▁almost ▁complete ▁elim ination ▁of ▁ 1 5 th ▁century ▁music ▁manuscript s ▁in ▁England , ▁largely ▁by ▁Henry ▁VIII ▁during ▁the ▁D iss ol ution ▁of ▁the ▁Mon aster ies ▁in ▁the ▁ 1 5 3 0 s , ▁it ▁is ▁not ▁surprising ▁that ▁most ▁of ▁Mort on ' s ▁music ▁surv ives ▁in ▁sources ▁from ▁the ▁Cont inent , ▁and ▁if ▁he ▁was ▁ever ▁active ▁as ▁a ▁music ian ▁in ▁his ▁native ▁land , ▁all ▁trace ▁is ▁lost . ▁ ▁E ight ▁pieces ▁surv ive , ▁all ▁r onde aux . ▁ ▁One ▁of ▁the ▁most ▁famous ▁of ▁them ▁is ▁the ▁earliest ▁known ▁setting ▁of ▁the ▁t une ▁l ' homme ▁arm é , ▁which ▁was ▁used ▁by ▁many ▁early ▁Renaissance ▁compos ers ▁as ▁a ▁cant us ▁firm us ▁for ▁the ▁Mass . ▁ ▁This ▁piece , ▁a ▁qu od lib et , ▁is ▁probably ▁dat able ▁to ▁May ▁ 1 4 6 4 ; ▁it ▁seems ▁to ▁have ▁been ▁written ▁as ▁a ▁departure ▁gift ▁for ▁another