The season of Pre-Lent, once marked by the Roman Catholic Church, developed in the seventh century and included the three Sundays before the beginning of Lent. These Sundays are Septuagesima, Sexagesima, and Quinquagesima—roughly 70, 60, and 50 days before Easter. The Ordinary Form of the Mass (Novus Ordo), introduced in 1969, does not officially celebrate Pre-Lent. However, these Pre-Lent Sundays are still included in the Extraordinary Form of the Mass (Traditional Latin Mass or Tridentine Mass). These three Sundays are also celebrated by certain other Christian denominations.