Utraquism, also called Calixtinism, was a belief amongst Hussites, a reformist Christian movement, that communion under both kinds should be administered to the laity during the celebration of the Eucharist. It was a principal dogma of the Hussites and one of the Four Articles of Prague.
Luther and Hus serving communion under both kinds together, an imaginative woodcut from 16th-century Saxony representing the affinity of Lutherans and Moderate Hussites
The Meeting at Křížky: Sub Utraque (1916), by Alphonse Mucha, The Slav Epic
The Hussites were a Czech proto-Protestant Christian movement that followed the teachings of reformer Jan Hus, a part of the Bohemian Reformation.
Execution of Jan Hus (1415) that sparked outrage in the Kingdom of Bohemia
The Hussite Wagenburg
Recreation of Hussite pavise from an original in the Museum of Prague
Painting celebrating the Catholic victory at the Battle of White Mountain (1620). In the coming years, Bohemia and Moravia were converted from Hussitism to Roman Catholicism by the Habsburgs.