There are actually two Priscas remembered, both celebrated today, both martyred in Rome in the early day of the persecutions, and both buried in the Catacomb of Priscilla.
Very little is known about either and historical accounts are probably speculation by later writers. What do we know? One was older and probably for whom the Catacomb is named; the other younger but both are revered as martyrs, holding close their faith in Christ unto death.
The catacombs themselves are quite impressive with many saints and even popes having been buried there. Though the relics are long since transferred away, the Early Christian artwork that adorns the walls really took my breath away not just considering the age but also the strength and courage behind them.
Finally, the Benedictine nuns who live there are a delight and their vestments are magnificent - a true testament to those whose lives are commemorated there and to those who carry on the work.
Every high priest is taken from among men
and made their representative before God,
to offer gifts and sacrifices for sins.
He is able to deal patiently with the ignorant and erring,
for he himself is beset by weakness
and so, for this reason, must make sin offerings for himself
as well as for the people.
No one takes this honor upon himself
but only when called by God,
just as Aaron was.
In the same way,
it was not Christ who glorified himself in becoming high priest,
but rather the one who said to him:
You are my Son:
this day I have begotten you;
just as he says in another place,
You are a priest forever
according to the order of Melchizedek.
In the days when he was in the Flesh,
he offered prayers and supplications with loud cries and tears
to the one who was able to save him from death,
and he was heard because of his reverence.
Son though he was, he learned obedience from what he suffered;
and when he was made perfect,
he became the source of eternal salvation for all who obey him.
-- Hebrews 5:1-10