The succession to the childless Elizabeth I was an open question from her accession in 1558 to her death in 1603, when the crown passed to James VI of Scotland. While the accession of James went smoothly, the succession had been the subject of much debate for decades. It also, in some scholarly views, was a major political factor of the entire reign, if not so voiced. Separate aspects have acquired their own nomenclature: the "Norfolk conspiracy", Patrick Collinson's "Elizabethan exclusion crisis", and the "Secret Correspondence".

Isabella Clara Eugenia, sometimes referred to as Clara Isabella Eugenia, was sovereign of the Spanish Netherlands, which comprised the Low Countries and the north of modern France with her husband, Archduke Albert VII of Austria.