There are dozens and dozens of saints with feast days in early Advent. However, the best known is probably Saint Nicholas of Myra on December 6.
The feast day of Saint Nicholas of Myra falls on December 6 each year, early in the Advent Season.
I am not sure what you mean by Advent Saint. There are hundreds of saints who have a feast day during Advent, including St. Nicholas of Myra. However, if any saint would be named as the Advent Saint it would be St. John the Baptist as the Gospels during Advent speak of him preparing the way for the Lord.
Saint Lucy's feast day is December 13 all over the world during the season of Advent.
St. Nicholas of Myra who has his feast day on December 6.
There are hundreds of saints with feast days during Advent. These are, perhaps, the best known:The Immaculate Conception - December 8Saint Nicholas - Dec. 6Saint Lucy - Dec. 13
Pope Benedict I is not a saint and has no feast day.
Saint Maria Goretti's Feast Day is July 6th.
The feast day of saint Mark is April 25.
Saint Christopher's feast day is July 25th.
Saint Laura's Feast Day is October the 19th.
Saint Helena's feast day is August 18.
July 24 is the feast day of Saint Charbel.