What important demand was granted to those who remained in Ireland after The Great Potato Fanine of 1815?

Answer 1

The famine was 1845 to 1848, with subsequent minor crop failures. The prime minister, William Ewart Gladstone, at last recognizing the necessity for drastic Irish reforms, disestablished the Protestant Church of Ireland in 1869 and in 1870 introduced the first Irish Land Act, which conceded the principles of secure tenure and compensation for improvements made to property.

There is more on the famine at this link.

Answer 2

I think you mean 1845