Today, Feast of the Most Precious Blood, is also in some places the Feast of S Aaron, a mighty Pontiff. I will not be so condescending as to imply that you need me to explain the appropriateness of such a coincidence!!
A too-forgotten but great churchman of the last century, Aaron Jean-Marie Lustiger, in the epitaph for himself that he composed and is still to be read in Notre Dame de Paris, listed S Aaron as his first Patron (and regarded himself as always a Jew, a "fulfilled Jew"). He suffered quite a bit from Jewish bigots who could not handle the phenomenon of "fulfilled Jews". As Cardinal Archbishop of Paris, he was observed celebrating a Qaddish for his mother, who had died in Auschwitz. He was a close friend and collaborator of S John Paul II, Papa Wojtyla.
Before the Ritualists began their great 'ecclesiological' mission of "Back to 1549", many Anglican Churches, in those days when the Eucharistic Celebrant stood at the North End of the Altar of Sacrifice, had a picture of S Aaron, vestments and thurible and all, above the Celebrant (and one of S Moses above the South End, where a deacon or Assistant Priest might stand). I think this may survive in S Magnus the Martyr, London Bridge.
One of the great tragedies of the corruption of Catholic Worship which followed (but was most definitely not mandated by) 'the Council' was the elimination of the old Prayer of Consecration of a Latin Catholic Bishop, which made typological references to the Vesture of the Aaronic priesthood.
Sancte Aaron, ora pro nobis.