(founded in Belfast) dedicated itself to founding a non-sectarian and independent Irish republic. The United Irishmen had particular strength in Belfast, Antrim and Down. Paradoxically however, this period also saw much sectarian violence between Roman Catholics and Protestants, principally members of the Church of Ireland (Anglicans, who practised the British state religion and had rights denied to both Presbyterians and Roman Catholics), notably the "Battle of the Diamond" in 1795, a faction fight between the rival "Defenders" (Roman Catholic) and "Peep O'Day Boys" (Anglican), which led to over 100 deaths and to the founding of the Orange Order. This event, and many others like it, came about with the relaxation of the Penal Laws and Roman Catholics began to be allowed to purchase land and involve themselves in the linen trade (activities which previously had involved many onerous restrictions). Protestants, including some Presbyterians, who in some parts of the province had come to identify with the Roman Catholic community, used violence to intimidate Roman Catholics who tried to enter the linen trade. Estimates suggest that up to 7000 Roman Catholics suffered expulsion from Ulster during this violence. Many of them settled in northern Connacht. These refugees' linguistic influence still survives in the dialects of Irish spoken in Mayo, which have many similarities to Ulster Irish not found elsewhere in Connacht. Loyalist militias, primarily Anglicans, also used violence against the United Irishmen and against Roman Catholic and Protestant republicans throughout the province. In 1798 the United Irishmen, led by Henry Joy McCracken, launched a rebellion in Ulster, mostly supported by Presbyterians. But the British authorities swiftly put down the rebellion and employed severe repression after the fighting had ended. In the wake of the failure of this rebellion, and following the gradual abolition of official religious discrimination after the Act of Union in 1800, Presbyterians came to identify more with the State and with their Anglican neighbours, due to their civil rights now being respected by both the state and their Anglican neighbours. The 1859 Ulster Revival was a major Christian revival that spread throughout Ulster. Industrialisation, Home Rule and partition In the 19th century, Ulster had the only large-scale industrialisation and became the most prosperous province on the island. In the latter part of the century, Belfast briefly overtook Dublin as the island's largest city. Belfast became famous in this period for its huge dockyards and shipbuilding – and notably