Dom Gueranger tells us that this is one of the most ancient feasts of the Church, and because St Paul died with his comrade in death, a festival in a sense of the whole apostolic college.
Today the focus is on St Peter (have your Peter's pence at the ready!); tomorrow more on St Paul. It is also the FSSP's patronal feast.
Because the Pope is inaugurating the Pauline Year, however, this year the balance will change a little with a special first Vespers showing on EWTN at 1.30am and again at 8am today.