ate ▁Saint ▁Leo ▁on ▁ 1 8 ▁February . ▁ ▁H ym ns ▁ ▁Tro par ion ▁( T one ▁ 3 ) ▁You ▁were ▁the ▁Church ' s ▁instrument ▁in ▁strength ening ▁the ▁teaching ▁of ▁true ▁doctrine ; ▁you ▁sh one ▁forth ▁from ▁the ▁West ▁like ▁a ▁sun ▁disp elling ▁the ▁errors ▁of ▁the ▁her et ics . ▁R igh te ous ▁Leo , ▁entre at ▁Christ ▁God ▁to ▁grant ▁us ▁His ▁great ▁mer cy . ▁ ▁Tro par ion ▁( T one ▁ 8 ) ▁O ▁Champion ▁of ▁Orth odox y , ▁and ▁teacher ▁of ▁hol iness , ▁The ▁en light en ment ▁of ▁the ▁universe ▁and ▁the ▁inspired ▁glory ▁of ▁true ▁bel ie vers . ▁O ▁most ▁wise ▁Father ▁Leo , ▁your ▁teach ings ▁are ▁as ▁music ▁of ▁the ▁Holy ▁Spirit ▁for ▁us ! ▁P ray ▁that ▁Christ ▁our ▁God ▁may ▁save ▁our ▁sou ls ! ▁ ▁Kont ak ion ▁( T one ▁ 3 ) ▁Se ated ▁upon ▁the ▁throne ▁of ▁the ▁priest hood , ▁gl orious ▁Leo , ▁you ▁shut ▁the ▁mouth s ▁of ▁the ▁spiritual ▁l ions . ▁With ▁div in ely ▁inspired ▁teach ings ▁of ▁the ▁hon ored ▁Tr inity , ▁you ▁shed ▁the ▁light ▁of ▁the ▁knowledge ▁of ▁God ▁up - on ▁your ▁f lock . ▁Therefore , ▁you ▁are ▁gl or ified ▁as ▁a ▁divine ▁initi ate ▁of ▁the ▁grace ▁of ▁God . ▁ ▁See ▁also ▁▁▁ ▁Christ ology ▁ ▁List ▁of ▁ 1 0 ▁longest - re ign ing ▁pop es ▁ ▁List