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In page Isabella Clara Eugenia:

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Formally from 1598-1599, and effectively beginning from 1601, the Archduke and Archduchess ruled the Spanish Netherlands together. Their reign is a key period in the history of the Spanish Netherlands. After Albert's death in 1621, sovereignty over their lands was returned to Spanish Habsburgs, and Isabella was appointed Governor of the Netherlands on the King of Spain's behalf. [1] She was succeeded as Governor by Cardinal-Infante Ferdinand of Austria, the third son of her half-brother in 1633.[citation needed]