The Netherlands were frequently governed directly by a regent or governor-general, who was a collateral member of the Habsburgs. By the Pragmatic Sanction of 1549 Charles V combined the Netherlands into one administrative unit, to be inherited by his son Philip II. Charles effectively united the Netherlands as one entity. The Habsburgs controlled the 17 Provinces of the Netherlands until the Dutch Revolt in the second half of the 16th century, when they lost the seven northern Protestant provinces. They held onto the southern Catholic part (roughly modern Belgium and Luxembourg) as the Spanish and Austrian Netherlands until they were conquered by French Revolutionary armies in 1795. The one exception to this was the period of (1601–1621), when shortly before Philip II died on 13 September 1598, he renounced his rights to the Netherlands in favor of his daughter Isabella and her fiancé, Archduke Albert of Austria, a younger son of Emperor Maximilian II. The territories reverted to Spain on the death of Albert in 1621, as the couple had no surviving offspring, and Isabella acted as regent-governor until her death in 1633: