What two things occured during the difficult period after the collapse of Mycenaean civilization

Mycenaean is the term applied to the art and culture of Greece from ca. 1600 to 1100 B.C. The name derives from the site of Mycenae in the Peloponnese, where once stood a great Mycenaean fortified palace. Mycenae is celebrated by Homer as the seat of King Agamemnon, who led the Greeks in the Trojan War. In modern archaeology, the site first gained renown through Heinrich Schliemann’s excavations in the mid-1870s, which brought to light objects whose opulence and antiquity seemed to correspond to Homer’s description of Agamemnon’s palace. The extraordinary material wealth deposited in the Shaft Graves at Mycenae (ca. 1550 B.C.) attests to a powerful elite society that flourished in the subsequent four centuries.