Sister Mary Antona Ebo was the only Black Catholic nun who marched with civil rights leader Martin Luther King Jr. in Selma, Alabama, in 1965. “I’m here because I’m a Negro, a nun, a Catholic, and because I want to bear witness,” Ebo said to fellow demonstrators at a March 10, 1965, protest attended by King.

The life and legacy of the Rev. Martin Luther King Jr. will once again be celebrated and honored on Monday.

All federal offices, courts, and most non-essential government offices will be closed.