Former states of the British Aden Protectorate were united in the 1960s to form the People's Republic of South Yemen, which became independent on 30 November 1967.South Yemen later merged with its northern counterpart to form the modern state of Yemen in 1990.
During the Italian unification, the monarchs of such agglomerated states lost their sovereignty and their titles became purely ceremonial.
During the Independent State of Croatia 1941–1945 the Habsburgs were officially dethroned, but since today's Republic of Croatia does not consider itself the successor of the Independent State of Croatia, following the succession rite king Karl's grandson Karl von Habsburg-Lothringen is the first in line to succeed to the Croatian throne.
Crown prince Amedeo Zvonimir of Savoy-Aosta Upon its independence from the kingdom of Yugoslavia in April 1941 the Independent State of Croatia was created under the protection of Italy and Germany.
A realm that was never diplomatically recognized by any state, is the Kingdom of Araucanía and Patagonia, a short-lived attempt at establishing a constitutional monarchy during the 19th Century.
It claimed the far southern stretches of South America where the native Mapuche were fighting to maintain their sovereignty against the advancing Argentine and Chilean forces.