After that date, most of Ireland left the United Kingdom to become the largely independent Irish Free State, a dominion within the British Empire; the remaining part, Northern Ireland, remained within the United Kingdom. Both the Free State and the United Kingdom, which changed its name to the United Kingdom of Great Britain and Northern Ireland in 1927, had the same person as monarch: George V. In 1937, the year after George V's death, the Free State adopted a new constitution which changed the state's name to "Ireland" (or "Éire" in Irish) and removed all mention of the monarch. In April 1949, Ireland was declared a republic, with the description of the "Republic of Ireland", and it left the Commonwealth of Nations. Since April 1949, the only part of the island of Ireland that has retained a monarchical system is Northern Ireland (as part of the United Kingdom of Great Britain and Northern Ireland).