▁to ▁August ▁ 1 5 5 5 . ▁In ▁January ▁ 1 5 5 5 , ▁he ▁accompanied ▁Card inal ▁Giovanni ▁Mor one , ▁pap al ▁leg ate ▁a ▁lat ere , ▁to ▁the ▁Diet ▁of ▁A ugs burg . ▁Upon ▁the ▁death ▁of ▁Pope ▁Julius ▁III , ▁Card inal ▁Mor one ▁and ▁Card inal ▁Otto ▁Tru chs ess ▁von ▁Wal db urg ▁returned ▁to ▁Rome ▁for ▁the ▁pap al ▁conc lave , ▁leaving ▁Bishop ▁D elf ino ▁as ▁the ▁only ▁pap al ▁representative ▁at ▁the ▁Diet . ▁In ▁July ▁ 1 5 5 5 , ▁he ▁tra ve led ▁to ▁Rome ▁to ▁report ▁on ▁the ▁Diet ▁to ▁Pope ▁Paul ▁IV . ▁The ▁new ▁po pe ▁named ▁him ▁nun cio ▁to ▁Ferdinand ▁I . ▁He ▁was ▁nun cio ▁to ▁the ▁H abs burg ▁Mon archy ▁from ▁ 2 2 ▁March ▁ 1 5 6 1 ▁until ▁October ▁ 1 5 6 5 . ▁He ▁participated ▁in ▁the ▁Council ▁of ▁Tr ent ▁ 1 5 6 2 - 6 3 ▁and ▁was ▁charged ▁with ▁con ve ying ▁the ▁dec isions ▁of ▁the ▁Council ▁to ▁the ▁German ▁b ish ops . ▁ ▁Pope ▁P ius ▁IV ▁made ▁him ▁a ▁cardinal ▁priest ▁in ▁the ▁cons istory ▁of ▁ 1 2 ▁March ▁ 1 5 6 5 . ▁He ▁received ▁the ▁red ▁hat ▁and ▁the ▁tit ular ▁church ▁of ▁Santa ▁Maria ▁in ▁Aqu iro ▁( a ▁de acon ry ▁raised ▁pro ▁il la ▁vice ▁to ▁the ▁status ▁of ▁title ) ▁on ▁ 7 ▁September ▁ 1 5