Sinterklaas in the context of "Saint Nicholas Day"

Saint Nicholas of Myra (traditionally 15 March 270 – 6 December 343), also known as Nicholas of Bari, was an early Christian bishop of Greek descent from the maritime city of Patara in Anatolia (in modern-day Antalya Province, Turkey) during the time of the Roman Empire. Because of the many miracles attributed to his intercession, he is also known as Nicholas the Wonderworker. Saint Nicholas is the patron saint of sailors, merchants, archers, repentant thieves, children, brewers, pawnbrokers, toymakers, unmarried people, and students in various cities and countries around Europe. His reputation evolved among the pious, as was common for early Christian saints, and his legendary habit of secret gift-giving gave rise to the folklore of Santa Claus ("Saint Nick") through Sinterklaas.

Little is known about the historical Saint Nicholas. The earliest accounts of his life were written centuries after his death and probably contain legendary elaborations. He is said to have been born in the Anatolian seaport of Patara, Lycia, in Asia Minor to wealthy Christian parents. In one of the earliest attested and most famous incidents from his life, he is said to have rescued three girls from being forced into prostitution by dropping a sack of gold coins through the window of their house each night for three nights so their father could pay a dowry for each of them. Other early stories tell of him calming a storm at sea, saving three innocent soldiers from wrongful execution, and chopping down a tree possessed by a demon. In his youth, he is said to have made a pilgrimage to Egypt and Syria Palaestina. Shortly after his return, he became Bishop of Myra. He was later cast into prison during the persecution of Diocletian, but was released after the accession of Constantine.

The Dutch letter (also referred to as banket letter, almond letter, butter letter, and in Dutch as banketstaaf, banketletter, boterletter, and letterbanket) is a type of pastry that is typically prepared using a mixture of flour, eggs and butter or puff pastry as its base and filled with almond paste (or persipan), dusted with sugar and shaped in an "S" or other letter shape. Marzipan, an almond paste prepared with almond meal and honey or sugar, is sometimes used as the filling. The Dutch letter has a porous or airy and flaky texture.

The pastry was originally shaped "into the initial of the family's surname." Nowadays, the most common shape of the food in the United States is as the letter "S". Dutch letters are served as a treat during December, and particularly on Sinterklaasavond on December 5 in the Netherlands, and during some festivals in the United States.