The last of these attempts resulted in the " Dorian conquest " of the "Achaeans " and " Ionians " of Peloponnese, and in the assignment of Argolis, Laconia and Messenia to the Heracleid leaders, Temenus, Aristodemus and Cresphontes respectively; of Elis to their Aetolian allies; and of the north coast to the remnants of the conquered Achaeans.
The conquest of Laconia at least is represented in 5th-century tradition as immediate and complete, though one legend admits the previous death of the Heracleid leader Aristodemus, and another describes a protracted struggle in the case of Corinth.
The 5th-century tradition that the Heracleid kings of Macedon were Temenid exiles from Argos may belong to the same cycle.
It is a noteworthy coincidence that in Macedonia also the royal family claimed Heracleid descent; and that " Pindus " is the name both of the mountains above Histiaeotis and of a stream in Doris.
Thucydides also accepts the story of Heracleid leadership.
The legend of an organized apportionment of Peloponnese amongst the Heracleid leaders appears first in the 5th-century tragedians, - not earlier, that is, than the rise of the Peloponnesian League, - and was amplified in the 4th century; the Aetolians' aid, and claim to Elis, appear first in Ephorus.
The enlarged version of the Heracleid claims in Isocrates (Archidamus, 120) and the theory that the Dorians were mere disowned Achaeans (Plato, Laws, 3).
In accordance with the tradition which assigned the portion to the eldest-born of the Heracleid conquerors, Argos was for some centuries the leading power in Peloponnesus.
The Thessalian League originated in the deliberate choice by village aristocracies of a single monarch who belonged from time to time to several of the so-called Heracleid families.