The mythical patriarch of the Dorians Hellenes was Danaus (for which reason they were called Danaans), who settled in Hellas along with Cadmus. According to the records written by the Greeks themselves, those were "Phoenician" Israelite immigrants from Egypt, and that they broke away from the main Israelite group led by Moses which ended up in Canaan.
It's commonly known that the Greek alphabet was initially copied from the "Phoenician" one. Ancient Greeks testified that was brought to them by Danaus and Cadmus, who again were Israelites.
Dorian settlements ought be linked with the introduction and increasing of Western-European related Y-DNA chromosomes (R1b-U152) and a corresponding ancestry (Dorian samples XAN053, XAN030, kro008 and kro009 got 63,2% of Celto-Germanic-like admixture and ancient inhabitants of Bronze Age Galatas even scored 70,5% of it, having scored 0,755 and 0,509 P-value for both respectively; also even helots of Messenia were Dorian-admixed, getting ≈20% of the Germanic-like ancestry represented by Early Medieval Saxons of England with P-value of 0,328).
Pre-Dorian Minoans and Mycenaeans were mostly dark-haired and -eyed, also the first happened to possess even less genes for lighter pigmentation, but we actually know classical Greeks known to us were fair-haired and light-eyed (60 Hellenic gods were blond, so were 181 and 109 mythic or fictitious and historical persons respectively, while on the other hand there were only 74 dark-haired ones out of all the three categories, see "Die blonden Haare der indogermanischen Völker des Altertums. Eine Sammlung der antiken Zeugnisse als Beitrag zur Indogermanenfrage", by Wilhelm Sieglin, page 136). These circumstances lead us to conclusion that Dorian invasion wasn't from the North, consisting of relatives to the Mycenaeans, but from the sea whence a genetically and genealogically different, fair-pigmentated population came from to form the historical Dorians.
Though there's another evidence worth of examining, and it's the letter from king Areus to the Judaean high priest Jonathan, in which he stated that the Israelites of Judaea and Dorian Spartans ("Lacedaemonians") are brethren through the common lineage from Abraham. It's said on Wikipedia that:
>a Greek writer contemporary of Areus, Hecataeus of Abdera, precisely published a work on the Jews, where he told that the Greek heroes Cadmeus and Danaos were expelled from Egypt at the same time as Post too long. Click here to view the full text.