The competition in the printing business at Kraków at that time was fierce,[REF][REF] and Vietor got into conflicts with other printers over printing rights several times.
Vietor's death date is not known precisely, but it must have been between September 25, 1546 (last mention in the acts of the vicariate of Kraków) and March 21, 1547, when his wife is mentioned as a widow [REF].