Sts. Nereus & Achilleus - Saints & Angels - Catholic Online
www.catholic.org/saints/saint.php?saint_id=2
Everything we know from authority about the two first- century martyrs comes from ... that they may always see God as their authority and obey God's orders first.
Nereus, Achilleus, Domitilla, and Pancras - Wikipedia
https://en.wikipedia.org/wiki/Nereus,_Achilleus,_Domitilla,_and_Pancras
Nereus, Achilleus, Domitilla, and Pancras are venerated as martyrs of the Roman Catholic Church. In the present General Roman Calendar, revised in 1969, Saints Nereus and Achilleus (together) and Saint Pancras have distinct celebrations (optional memorials) on 12 May.