Pierre Chrétien De Geyter (; 8 October 1848 – 26 September 1932) was a Belgian socialist (who later became a communist) and a composer, known for writing the music of The Internationale.De Geyter was born in Ghent, Belgium, where his parents, originally from the French Flanders, had moved to work in the textile factories. When he was seven, the family, who already counted five children, returned to France and settled in Lille. Pierre worked there as a thread maker and learned how to read and write at workers' evening classes. At age sixteen, he enrolled at the Lille Academy where he first took drawing classes, which allowed him to find a job as a woodcarver. He later took music classes, and joined the workers' choir "La Lyre des Travailleurs", founded by the socialist leader of Lille, Gustave Delory.