Philibert van Serooskerke (1537-1579), viscount of Zealand, steward of Zealand West of the Scheldt and governor of Bergen op Zoom was the chief administrator in Zealand for Philip II, king of Spain and lord of the Habsburg-Burgundian Netherlands. On the basis of a biographical study in historical context, this dissertation aims to bridge the gap between what is known about the motives of the Dutch Revolt’s initiators, and the contrasting attitude of a high-ranking civil servant who remains loyal to his sovereign and to the central administration of the Low Countries. The lord of Serooskerke is not a generally known figure in the political history of the early decades of the Dutch Revolt or Eighty Years’ War. European historiography of that era generally focuses on emperors and popes, queens and kings, admirals and field-marshals, statesmen and stadtholders. It describes the events caused by their schemes and ambitions, rivalry, relations, failures and successes in response to the spirit of the age. With reference to the Dutch Revolt, much has been written about the prominent vassals of Philip II, the grand seigneurs who rose against him and took the lead in the rebellion in its early phase: Hendrick van Brederode; the counts of Egmont, Horne, Montigny, Hoogstraten; the marquess of Bergen; and – last but not least – the prince of Orange, the king’s stadtholder or locum tenens in the provinces of Holland and Zealand. Particularly with regard to these two provinces, the motives and considerations of civil administrators were far less a subject of historical review, notwithstanding their crucial role. The administrators in charge were forced to choose between allegiance to their superior – the rebellious prince – and loyalty to their overlord the Spanish king, sovereign count of Holland and Zealand. Philibert van Serooskerke is a perfect example, because of his rank as viscount of Zealand and his functions of royal counsellor, steward, grand bailiff and supreme dike-reeve in Zealand West-of-Scheldt. His obligations ...