These are some important Catholic traditions and when they were established.
431- Infant baptism renews the soul established
593- Sins need to be purged established by Pope Gregory I
600- All prayers must be directed towards Mary, dead saints, and angels
786- The cross and other images and relics now need to be worshiped
1000- Attending mass was now
mandatory with punishment being mortal sin
1079- Priests must now be
celibate as
instituted by Pope Gregory VII
1090- Rosary invented by Peter the Hermit
1184- Inquisition begins
1190- The sale of indulgences begins
1215-Transubstantiation, proclaimed by Pope Innocent III
1545- Traditions became just as important as bible due to the Council of Trent
1854- Mary's conception proclaimed immaculate by Pope Pius IV
1870- Pope proclaimed infallible by Vatican council
Information from
http://www.pro-gospel.org/01/ea-013.php