Question

What is the contribution of pre Yiddish to European languages? I
rather unusual assume that population who speak later Yiddish did not
live traces in absorbed languages. Literature give picture of quick
creation of Yiddish and after 1200AD the Yiddish language do not
change substantially or the language change process is rather slow.
Even if given take fact that Yiddish speaking population moved to
other language area. It present that the Yiddish is fully established
language rather resistant to changes. Is it possible that rather
small group may affect larger population if power structure was
correct propitious? Is the old Yiddish similar to other languages,
existing around Caspian Sea.

There is rather very contradictory information. Some sources suggest
some braoun or hazel-eyed population influence and creation of
Germanic branch from those migrated groups. Other Hebrew or even
Bantu roots.

There are any traces ethnic or linguistic after abandoned 50
thousands men Hannibal army who failed to conquer Rome? Did they all
die? Perhaps part deserted or live distributed in small groups in
hard to reach or unimportant areas like Albania or Schwartzwald. Why
the mare Negro, Schwartzwald. Not every forest is called dark even if
is dark and dense. Some quite opposite are called White even if there
are the wildest remaining complexes of European forests.