Conversation so far:
Where did the Etruscan civilization start?
A culture that is identifiably Etruscan developed in Italy about 900 BC.
What was the Etruscan civilization's origin?
There are three main hypotheses as to the origins of the Etruscan civilization in the Early Iron Age. The first is autochthonous development in situ out of the Villanovan culture.
Are there any other interesting aspects about this article on the Etruscan civilization besides their origins and start?
Etruscan civilization endured until its assimilation into the Roman society, beginning in the late 4th century BC with the Roman–Etruscan Wars.
Where did Etruscans, Pelasgians or Tyrrhenians pass by while getting to the Italian Peninsula?
Hellanicus of Lesbos reports a Pelasgian migration from Thessaly in Greece to the Italian peninsula.

Question: what lands did they become masters of
Self-contained rewrite: What lands did Etruscans, Pelasgians or Tyrrhenians become masters of?