 The castle's name first appears in documents in 1214.One from 1377 says “"in dem Dayle zu Lichtenberg"”, and one from 1480 “"im Dale zu Liechtinberg"” (both these examples show forms of "Tal" rather more similar to the word's English cognate).Another document in 1445 read “"zu Dalen"”, and indeed, it is still customary nowadays to refer to Thallichtenberg as "de Dal" in the local speech.