Yssel

In a convent of nuns at Yssel in the Netherlands, a single nun, Maria de Sains, caused one of the most fearful calamities among her sisters that has ever been known.

As to the origin of the name, it was long held to be derived from the river Yssel or Saal.

On the Tabula Peutingeriana appear the “Chamavi qui et Pranci,” which should doubtless read “qui et Franci”; these Chamavi apparently dwelt between the Yssel and the Ems.

Theobald observed that there was no river of that name in Denmark, nor any resembling it in name but "Yssel, from which the province of Overyssel derives its name in the German Flanders."

Steevens, however, is well content to take this Yssel as that which Hamlet had in his thoughts.