1903
The first Sunday Mass celebrated in the basement of the new Epiphany Church, Uptown
1916
Dedication of the first Nativity Church, North Side, the former Mt. Zion Lutheran Church
1935
Dedication of the second St. Teresa of Avila Church, Perrysville
1959
Ground broken for the second St. Agnes School, West Mifflin
1964
Dedication of the first St. Louise de Marillac Church/school, Upper St. Clair
1970
The diocese introduced the New Order of Mass, which replaced the traditional Roman Missal in use since 1570
1970
Joseph Pace of Holy Rosary Parish installed at the first lay Eucharistic Minister of the diocese
1995
The Cenacle Sisters withdraw from the Diocese of Pittsburgh
