graves of Mycenae Tiryns: * see endnote 17

a major Mycenaean citadel, located in Argolis, near Mycenae, already important by the Middle Helladic period. Near the sea, it controlled the trade routes between the mainland and the Aegean centers. Inhabited before the Bronze Age, ancient Greeks believed that the citadel was built by Proitos, brother of the king of Argos, Akrisios, and grandfather of Perseus, the founder of Mycenae.

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Leucippus (his existence):
IDiogenes Laertius (3rd century AD) claims in his Life of Epicurus, that Leucippus (5th century BC) never existed.  Epicurus is the philosophical heir of Democritus (a studet of Leucippus); his words have weight.  In his Corpus Democriteum, Thrasyllus of Alexandria  (astrologer & writer living under the emperor Tiberius 14–37 AD), compiled a list of writings on atomism.  He lists Democritus & attributes the idea to him while excluding Leucippus.

milliards:

one thousand millions; equivalent to U.S. billion (1,000,000,000).