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As for Wierzynek, Longinus gives us only his surname. A merchant family of this name, one of Cracow's most affluent and influential, used to live in the city for centuries. Its progenitor, Mikołaj Wierzynek, arrived in Cracow from the Rhineland, or what is now western Germany, at the beginning of the 14th century. And of course his name wasn't really Mikołaj Wierzynek, but Nikolaus Wirsing; it was only years later that his descendants Polonized the German surname to "Wierzynek". He served as a member of the city council of Cracow and later as a mayor of the nearby salt-mining town of Wieliczka. He was even named Pantler of Sandomierz, but it doesn't mean he was actually responsible for the royal pantry whenever the king was in that city; it had already become a purely titular office, but it carried great prestige a prestigious one and was reserved for the nobility. So how did a Rhenish merchant become a Polish nobleman? We don't know for sure, but there were basically three options to achieve this status: ennoblement, naturalization and imposture. Whichever it was, Wirsing was certainly a man of means who enjoyed a high level of the king's trust -- in other words, an ideal candidate for organizing a great banquet designed to wow the emperor and other monarchs, and to glorify Casimir the Great's kingdom, which was just making its debut as a serious player on the international stage.

There's only one but: Pantler Nikolaus Wirsing died in 1360, that is, 3--4 years before the banquet. So if it wasn't him who threw the most famous party of medieval Poland, then it must have been one of his family members. His family grew quickly after he had settled in Cracow, but , out of a number of Wirsings residing in Cracow in 1364, historians have been able to identify one particular Wirsing who could have been responsible for the banquet; it was the pantler's son, Nikolaus Wirsing Junior, who, like his father, served as a Cracow councillor and, unlike his father, isn't known to have accomplished much else. Hence the conclusion that Junior held the banquet, perhaps in his own house, but he did it in the name of the city, spending money from the city's budget.<ref>S. Kutrzeba, ''op. cit.''</ref>