On October 11, 1954 Pope Pius XII instituted the feast of the queenship of Mary......
"51. By this Encyclical Letter We are instituting a feast so that all may recognize more clearly and venerate more devoutly the merciful and maternal sway of the Mother of God. We are convinced that this feast will help to preserve, strengthen and prolong that peace among nations which daily is almost destroyed by recurring crises. Is she not a rainbow in the clouds reaching towards God, the pledge of a covenant of peace? "Look upon the rainbow, and bless Him that made it; surely it is beautiful in its brightness. It encompasses the heaven about with the circle of its glory, the hands of the Most High have displayed it." Whoever, therefore, reverences the Queen of heaven and earth--and let no one consider himself exempt from this tribute of a grateful and loving soul--let him invoke the most effective of Queens, the Mediatrix of peace; let him respect and preserve peace, which is not wickedness unpunished nor freedom without restraint, but a well-ordered harmony under the rule of the will of God; to its safeguarding and growth the gentle urgings and commands of the Virgin Mary impel us.
52. Earnestly desiring that the Queen and Mother of Christendom may hear these Our prayers, and by her peace make happy a world shaken by hate, and may, after this exile show unto us all Jesus, Who will be our eternal peace and joy, to you, Venerable Brothers, and to your flocks, as a promise of God's divine help and a pledge of Our love, from Our heart We impart the Apostolic Benediction.
53. Given at Rome, from St. Peter's, on the feast of the Maternity of the Blessed Virgin Mary, the eleventh day of October, 1954, in the sixteenth year of our Pontificate."
Something much less significant also happened on Oct. 11, 1954. I was born. :-)