 For example, The Nativity of the Lord Jesus (Christmas) (25 December) is a solemnity which is always a holy day of obligation, whereas the Nativity of Saint John the Baptist (24 June) is not a holy day of obligation.In certain locales, certain days which are celebrated as feasts or memorials in most of the Church are celebrated as solemnities; for example, St. Patrick's Day is a solemnity in Ireland, but is normally a memorial for the rest of the Church; Our Lady of Sorrows is a solemnity in Slovakia, whereas it is a memorial in all other places.The ranking of feast days of saints and of Christian mysteries such as the Ascension of the Lord, which had grown from an original division between doubles and simples, developed into a more complicated hierarchy of "Simple", "Semidouble", and "Double", with feast days of the Double Rite further divided into "Double of the I Class", "Double of the II Class", "Greater Double" or "Major Double", and "Double", in order of descending rank.