Last year, Cardinal Wilton Gregory became the first African American to participate in a papal conclave, which eventually elected Pope Leo XIV. While there have been African cardinals from the earliest days of the Church, Cardinal Gregory is the first U.S. citizen of African descent to wear the red cassock. The history-making prelate will concelebrate and preach at the diocese’s annual Rev. Dr. Martin Luther King, Jr., Mass at 10 a.m. Jan. 17 at Xavier College Preparatory High School’s Chapel of Our Lady in Central Phoenix.