West Frisia (West Frisian: West Fryslân; Dutch: West-Friesland) or West Friesland is along with East Frisia and North Frisia one of the most commonly used subdivisions of Frisia.
The territory of West Frisia is located in the Netherlands.
Lordship of Frisia / Lordship of Friesland during the Guelderian Wars
West Friesland historic, maybe wrong for Vlieland and Terschelling
Friesland province in the Republic of the Seven United Netherlands, Vlieland and Terschelling are in Holland province
Lordship of Frisia 1680 divided into kwartiers Westergo, Oostergo, Zevenwouden, Steden 
Departement Friesland 1807 - Kingdom of Holland
Frise department 1811 - 1814 part of France
1815 - 1830
Under German occupation Vlieland and Terschelling become part of Friesland province
Friesland (Fryslân) province
West Friesland (region)