Johannes Stinstra was a Mennonite preacher in the Frisian town of Harlingen.
It is the language in everyday use everywhere but in Friesland, where ancient Frisian is spoken.
About half of Friesland's 600,000 residents speak both Dutch and Frisian .
This would suggest the Frisians , English and Scots are similar, but that they differ from the Welsh and Irish.
In the Netherlands, Frisian , Turkish, and Arabic are also spoken.
There are several Frisian museums, libraries, archives and cultural centres in both countries.
This farthest extent of Frisian territory is known as Frisia Magna.
The Frisians live in Friesland, one of the Netherlands' northern provinces.
In particular, it would be very much in keeping with Frisian practice in this period to use just a single name.
The western portion was inhabited by the Batavians and became part of a Roman province; the eastern portion was inhabited by the Frisians .