▁peace ▁in ▁the ▁church . ▁ ▁Books ▁▁ ▁Patri arch ▁Ya ʿ qu b ▁wrote ▁at ▁least ▁thirty ▁books ▁about ▁the ▁history ▁of ▁the ▁Church , ▁spiritual ity ▁and ▁lit ur gy ▁including ▁a ▁History ▁of ▁the ▁Church ▁until ▁the ▁ 6 th ▁century , ▁a ▁History ▁of ▁the ▁Sy rian ▁Church ▁in ▁India , ▁a ▁compar ative ▁study ▁of ▁Sy ri ac ▁and ▁Arab ic ▁languages , ▁and ▁Person age aph ies ▁of ▁ ▁E ph rem ▁the ▁Sy rian , ▁Phil ox en us ▁of ▁M ab bug , ▁and ▁Ya ʿ qu b ▁of ▁Ser ugh . ▁Stud ents ▁of ▁the ▁church ▁consider ▁his ▁lecture ▁as ▁an ▁author itative ▁on ▁the ▁Sy rian ▁Orth odox ▁Church ▁at ▁the ▁University ▁of ▁Gött ingen ▁in ▁ 1 9 7 1 . ▁ ▁Sy ri ac ▁music ▁▁ ▁Patri arch ▁Ya ʿ qu b ▁was ▁sk illed ▁in ▁and ▁knowledge able ▁about ▁Sy ri ac ▁music . ▁He ▁was ▁end owed ▁with ▁a ▁sharp ▁memory ▁that ▁enabled ▁him ▁to ▁memor ize ▁over ▁ 7 0 0 ▁mel od ies ▁of ▁the ▁Beth ▁Gaz o ▁including ▁variants ▁( Sh uh lop he ). ▁He ▁had ▁a ▁voice ▁of ▁a ▁" night ing ale " ▁as ▁Patri arch ▁Ign ati us ▁Zak ka ▁I ▁I was ▁tells ▁us . ▁He ▁learned ▁the ▁Beth ▁Gaz o ▁from ▁another ▁master ▁of ▁Sy ri ac ▁music , ▁Mor ▁Y ul ios ▁E lias ▁Q oro , ▁then ▁Patri arch al ▁De legate ▁in ▁India . ▁ ▁He ▁was