Tithe Commutation Act 1838

The Tithe War (Irish: Cogadh na nDeachúna) was a campaign of nonviolent civil disobedience, punctuated by sporadic violent episodes, in Ireland between 1830 and 1836 in reaction to the enforcement of tithes on the Roman Catholic majority for the upkeep of the established state church – the Church of Ireland. Tithes were payable in cash or kind and payment was compulsory, irrespective of an individual's religious adherence.

Tithe payment was an obligation on those working the land to pay ten per cent of the value of certain types of agricultural produce for the upkeep of the clergy and maintenance of the assets of the church. After the Reformation in Ireland of the 16th century, the assets of the church were allocated by King Henry VIII to the new established church. The majority in Ireland who remained loyal to the old religion were then obliged to make tithe payments which were directed away from their own church to the reformed one. This increased the financial burden on subsistence farmers, many of whom were at the same time making voluntary contributions to the construction or purchase of new premises to provide Roman Catholic places of worship. The new established church was supported by only a minority of the population, seventy-five percent of whom continued to adhere to Roman Catholicism.

Emancipation for Roman Catholics was promised by Pitt during the campaign in favour of the Act of Union of 1801 which was approved by the Irish Parliament, thus abolishing itself and creating the United Kingdom of Great Britain and Ireland. The king, however, refused to keep Pitt's promises, and it was not until 1829 that the Duke of Wellington's government finally conceded to the Roman Catholic Emancipation Act, in the teeth of defiant royal opposition. However, the obligation to pay tithes to the Church of Ireland remained, causing much resentment. Roman Catholic clerical establishments in Ireland had refused government offers of tithe-sharing with the established church, fearing that British government regulation and control would come with acceptance of such money.

...
Wikipedia