Question: John III of Egmont, was first Count of Egmont, Lord of Baer, Lathum, Hoogwoude, Aarstwoude, Purmerend, Purmerland and Ilpendam, and Stadtholder of Holland, Zeeland and West-Friesland, in the Low Countries, stadtholder, is an office of steward, designated a medieval official, and then a what?

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Bread and Cheese Revolt: The Bread and Cheese Revolt in Kennemerland, North Holland, was a folk uprising in 1491—92 when peasants and fishermen were provoked by an economic crisis, the tax oppression and garrison policy of John III of Egmont, stadtholder of Maximilian I.  The revolt took its name from the emblems on the banners of insurgents.

Hof van Holland: The Hof van Holland, Zeeland en West-Friesland (] ; usually shortened to Hof van Holland in the literature, and translated in English literature as "(High) Court of Holland") was the High Court of the provinces of Holland (including West Friesland) and Zeeland, instituted as a separate entity of the government of the Counties of Holland and Zeeland in 1428, under the Burgundian and Habsburg Netherlands, and continued with little change under the Dutch Republic, Batavian Republic, and the Kingdom of Holland, until its dissolution in 1811 by the First French Empire.  It should not be confused with the "Hoge Raad van Holland en Zeeland" which was the supreme court, founded in 1582 by the States-General of the Netherlands and intended for the entire Dutch Republic.  The "Hof" was in practice the main Appellate court in Holland and Zeeland, and in number of cases-handled the most important in the entire Dutch Republic (in comparison to the sister-provincial courts like the "Hof van Friesland") and its Precedents played an important role in the development of Roman-Dutch law, which is still influential in Southern Africa.

Hoge Raad van Holland en Zeeland: The Hoge Raad van Holland, Zeeland en West-Friesland (] ; usually translated in the literature as "High Court of Holland and Zeeland," though "Supreme Court" may better designate its function, and the literal translation is: "High "Council" of Holland and Zeeland") was the supreme court of the provinces of Holland and Zeeland in the Dutch Republic in the period 1582-1795.  This court is considered a direct predecessor of the current "Hoge Raad der Nederlanden" (Supreme Court of the Netherlands).  It played an important role in the formation of Roman-Dutch law, which still influences law in Southern Africa, through its jurisprudence.

John IV of Egmont: John IV of Egmont (or Egmond) (1499, Egmond aan den Hoef – April 1528, near Ferrara) was second Count of Egmont, Lord of Hoogwoud, Aartswoud and Baer, and tenth Lord of Purmerend, Purmerland and Ilpendam.

Second Stadtholderless Period: The Second Stadtholderless Period or Era (Dutch: "Tweede Stadhouderloze Tijdperk" ) is the designation in Dutch historiography of the period between the death of stadtholder William III on March 19, 1702 and the appointment of William IV as stadtholder and captain general in all provinces of the Dutch Republic on May 2, 1747.  During this period the office of stadtholder was left vacant in the provinces of Holland, Zeeland, and Utrecht, though in other provinces that office was filled by members of the House of Nassau-Dietz (later called Orange-Nassau) during various periods.  During the period the Republic lost its Great-Power status and its primacy in world trade, processes that went hand-in-hand, the latter causing the former.  Though the economy declined considerably, causing deindustralization and deurbanization in the maritime provinces, a "rentier"-class kept accumulating a large capital fund that formed the basis for the leading position the Republic achieved in the international capital market.  A military crisis at the end of the period caused the fall of the States-Party regime and the restoration of the Stadtholderate in all provinces.  However, though the new stadtholder acquired near-dictatorial powers, this did not improve the situation.

Gillis van Berlaymont: Gilles van Berlaymont (c. 1545 – 18 June 1579 in Maastricht) was stadtholder for the Spanish Crown of Drenthe, Friesland, Groningen and Overijssel (1572-1573), stadtholder of Guelders (1572-1577), substitute stadtholder of Holland, Zeeland and Utrecht (1574-1577), stadtholder of Namur and Artois (after 1578) and baron of Hierges.

Philip, Count of Egmont: Philip, Count of Egmont (1558 – Ivry March 14, 1590) was the fifth Count of Egmont, prince of Gavere and 12th and last Lord of Purmerend, Purmerland and Ilpendam.

Stadtholder: In the Low Countries, stadtholder (Dutch: "stadhouder" , ] ), is an office of steward, designated a medieval official and then a national leader.

John III of Egmont: John III of Egmont (or Egmond) (Hattem, April 3, 1438 – Egmond, August 21, 1516) was first Count of Egmont, Lord of Baer, Lathum, Hoogwoude, Aarstwoude, Purmerend, Purmerland and Ilpendam, and Stadtholder of Holland, Zeeland and West-Friesland.

Ilpenstein Castle: Ilpenstein Castle (Dutch:"Ilpenstein", "Huis te Ilpendam", "Hof te Ilpendam") was a castle of the Free and high Lordship of Purmerend, Purmerland and Ilpendam, located in Ilpendam (Waterland) in the north of the city of Amsterdam.

Supporting paragraphs: John III of Egmont Stadtholder
Answer: national leader