The Republic of Ireland Act 1948 (No. 22 of 1948) is an Act of the Oireachtas (parliament) which declared that Ireland may be officially described as the Republic of Ireland, and vested in the President of Ireland the power to exercise the executive authority of the state in its external relations, on the advice of the Government of Ireland. The Act was signed into law on 21 December 1948 and came into force on 18 April 1949, Easter Monday, the 33rd anniversary of the beginning of the Easter Rising.
The Act ended the remaining statutory role of the British monarchy in relation to the state, by repealing the 1936 External Relations Act, which had vested in George VI and his successors those functions which the Act now transferred to the President.
The Republic of Ireland Act is itself quite short, running to just 5 brief sections, and is therefore set out in full as follows:
Number 22 of 1948
The Republic of Ireland Act, 1948
An Act to repeal the Executive Authority (External Relations) Act, 1936, to declare that the description of the State shall be the Republic of Ireland, and to enable the President to exercise the executive power or any executive function of the state in or in connection with its external relations. (21 December 1948)
Be it enacted by the Oireachtas as follows:—
1.—The Executive Authority (External Relations) Act, 1936 (No. 58 of 1936), is hereby repealed.
2.—It is hereby declared that the description of the State shall be the Republic of Ireland.
3.—The President, on the authority and on the advice of the Government, may exercise the executive power or any executive function of the State in or in connection with its external relations.
4.—This Act shall come into operation on such day as the Government may by order appoint.
5.—This Act may be cited as The Republic of Ireland Act, 1948.
Section 1 of the Act repealed the Executive Authority (External Relations) Act 1936. By doing so the Act abolished the last remaining functions of the King, then George VI, in relation to the Irish state. These functions had related to the issuance and acceptance of letters of credence of diplomatic and consular representatives and the conclusion of international agreements. Section 3 provides that the President of Ireland may instead exercise these functions and any other functions in relation to the state's external (or foreign) relations. This effectively upgraded the President to a full head of state.