This page lists historical and other events on May 21st in Catalonia and the Catalan-speaking countries as well as festivals and a list of births and deaths of well-known Catalans.
1363 - València: Pedro the Cruel of Castile, attacks the city and the siege begins, which would last until June 10th, when it was withdrawn due to heroic defence by the Valencians, commanded by Prince Alfons (The War of the Two Peters).
1462 - Saragossa (Aragon): Joan II signs the Treaty of Baiona.
1981 - Terra Lliure attacks Federico Jiménez Losantos.
1841 - Sabadell (Vallès Occidental): Fèlix Sardà i Salvany, Catalan religious apologist and writer.
1904 - Barcelona: Anna Murià i Romaní, Catalan writer, translator and journalist.
1909 - el Grau de València: Agustí Centelles, photographer (died 1985).
1917 - El Vilar de Cabó (Alt Urgell): Cebrià Baraut i Obiols, (died 2003) historian and Benedictine monk.
1877 - Reus, Baix Camp: Pere Mata i Fontanet, Catalan doctor.
1966 - Barcelona: Ricard Opisso i Sala, Catalan illustrator caricaturist (born 1880).