They are those poor Quadi (WICKED PEOPLE) who always go along with the Marcomanni (MARCHMEN), in the bead-roll Histories one reads; and I almost guess they must have been of the same stock: "Wickeds and Borderers;" considered, on both sides of the Border, to belong to the Dangerous Classes in those times.
Two things are certain: First, QUAD and its derivatives have, to this day, in the speech of rustic Germans, something of that meaning,--"nefarious," at least "injurious," "hateful, and to be avoided:" for example, QUADdel, "a nettle-burn;" QUETSchen, "to smash" (say, your thumb while hammering); &c.

&c.

And then a second thing: The Polish equivalent word is ZLE (Busching says ZLEXI); hence ZLEzien, SCHLEsien, meaning merely BADland, QUADland, what we might called DAMAGitia, or Country where you get into Trouble.

That is the etymology, or what passes for such.

As to the History of Schlesien, hitherwards of these burial urns dug up in different places, I notice, as not yet entirely buriable, Three Epochs.
FIRST EPOCH; CHRISTIANITY: A.D.966.