Lady Day

Assumption of the Blessed Virgin MaryAlso known as

  • Dies Mariae Deiparae
  • Day of Mary Mother of God


A title still commonly used in Ireland and elsewhere for the feast of the Assumption, 15 August. “Day of Mary Mother of God” is the primitive title for the feast. The old Armenian calendar (5th century) carried it for the date corresponding to 15 August under the title of the “Annunciation of the Mother of God” referring to the decree of the Council of Ephesus (c.431) which declared as a dogma of faith that Mary was truly the Mother of God.

MLA Citation

  • “Lady Day”. New Catholic Dictionary. CatholicSaints.Info. 15 August 2016. Web. 18 January 2019. <>