Queen Anne's law
In 1703, in the reign of Queen Anne, a law was enacted (2 Anne c6 (Ir)) by the English parliament, which is commonly known as the Gavelkind Act.[2] This law made sectarian affiliation a primary determinant of the inheritance of land. When a Catholic died, his estate would normally be divided equally among his sons. However, if his eldest son converted to the Protestant faith, that eldest son alone would inherit all the land, and all his Catholic brothers would be disinherited. The law was intended to put land into the hands of Protestants, and to reduce the size, and therefore influence, of Catholic landed estates.[2]
https://en.wikipedia.org/wiki/Gavelkind_in_Ireland