Many documents and books mention it from the 18th century.

Further documents from 1700 and 1714 also mention the instrument.

Although, documents mentioning the area but not the church in 1097 exist.

The first written document mentioning the location comes from 1298.

The final document mentioned such issues, but did not shift the focus away from politics to economics.

The first document mentioning a church at this site dates back to 1698.

The first document mentioning the spa was written in 1533.

The earliest written document mentioning the town is from the year 1293.

In the year 1335 the first documents mention the area as "Zedelndorp".

The first historical document mentioning the name of the city dates to March 20, 1320.