Replied to a tweet by Ela_Hadrun (Twitter)

THE IMMACULATE CONCEPTION ONLY DATES TO 1854?!?!?! https://t.co/nRoLqH4rgv
— Casey would be the December / of our December (@Ela_Hadrun) December 8, 2019

As dogma, for which we can “thank” Pius IX. The idea existed earlier.
— Chrissy Steals Christmas (@C_Stroop) December 8, 2019

[Raymond] Llull is the first author to use the expression “Immaculate Conception” to designate the Virgin’s exemption from original sin.[19] He appears to have been the first to teach this doctrine publicly at the University of Paris.

–via Wikipedia referencing Mary in the Middle Ages: the Blessed Virgin Mary in the Thought of Medieval Latin Theologians, Fr. Luigi Gambero, S.M., Ignatius Press: San Francisco, 2005.