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