Wincenty of Kielcza
Wincenty of Kielcza (c. 1200 – after 1262) was a Polish canon, poet, and composer, working in Kraków and writing in Latin. He was a member of the Dominican Order. Most likely born in the village of Kielcza (however some historians believe that he was born in Kielce), he is best known for his hymn "Gaude Mater Polonia". Wincenty also wrote a shorter and a longer life of Saint Stanislaus of Szczepanów for his canonization. References  

1200s births
1260s deaths
Polish composers
Canons of Kraków
Polish Dominicans
13th-century Polish clergy