St. Martin's croissant (Polish: rogal świętomarciński) is a croissant, a type of Viennoiserie, with white poppy-seed filling traditionally prepared in Poznań and some parts of Greater Poland region on the occasion of St. Martin's Day (11 November).
On 30 October 2008, the name and recipe for rogal świętomarciński was entered in the register of protected designations of origin and protected geographical indications in the European Union.
Poznań (Polish: [ˈpɔznaj̃] or [ˈpɔznaɲ] ) is a city on the River Warta in west Poland, within the Greater Poland region. The city is an important cultural and business center and one of Poland's most populous regions with many regional customs such as Saint John's Fair (Jarmark Świętojański), traditional Saint Martin's croissants and a local dialect. Among its most important heritage sites are the Renaissance Old Town, Town Hall and Poznań Cathedral.
Poznań is the fifth-largest city in Poland. As of 2023, the city's population is 540,146, while the Poznań metropolitan area (Metropolia Poznań) comprising Poznań County and several other communities is inhabited by over 1.029 million people. It is one of four historical capitals of medieval Poland and the ancient capital of the Greater Poland region, currently the administrative capital of the province called Greater Poland Voivodeship.