The Ottoman Armenian population mostly belonged to either the Armenian Apostolic Church or the Armenian Catholic Church. They were part of the Armenian millet until the Tanzimat reforms in the nineteenth century equalized all Ottoman citizens before the law. Armenians were a significant minority in the Empire. They played a crucial role in Ottoman industry and commerce, and Armenian communities existed in almost every major city of the empire. Despite their importance, Armenians were heavily persecuted by the Ottoman authorities especially from the latter half of the 19th century, culminating in the Armenian Genocide.