Magister Petrus was created a Cardinal Deacon by Pope Nicholas IV ( Hieronymus Maschi ) on 16 May 1288 , along with five others .
Magister Petrus was was assigned the Deaconry of San Giorgio in Velabro ( velum aureum ) .
Magister Petrus was created a Cardinal Deacon by Pope Nicholas IV ( Hieronymus Maschi ) on 16 May 1288 , along with five others , and was assigned the Deaconry of San Giorgio in Velabro ( velum aureum ) .