Interregnums

expression in Catholic and Anglican canon law referring to an episcopal vacancy

1939–1975 dictature period of Spain

Central European state between 1920 and 1946

An interregnum (plural interregna or interregnums) is a period of discontinuity or "gap" in a government, organization, or social order. Archetypally, it was the period of time between the reign of one monarch and the next (coming from Latin inter-, "between" and rēgnum, "reign" [from rex, rēgis, "king"]), and the concepts of interregnum and regency therefore overlap. Historically, longer and heavier interregna have been typically accompanied by widespread unrest, civil and succession wars between warlords, and power vacuums filled by foreign invasions or the emergence of a new power.

puppet state proposed in 1916 by Germany and Austria-Hungary

period of Russian history from 1598 to 1613

elected official who is about to leave office

war prompted by a succession crisis in which two or more individuals claim the right of successor to a deceased or deposed monarch

regency

period of Italian history without a centralized ruler (574/5–584/5)

period of the Holy Roman Empire’s history between 1245, when Frederick II was deposed (or 1250, when Frederick II died, or 1254, when his son Conrad IV died) and the accession of Rudolf I in 1273