Balakros (Ancient Greek: Bάλακρoς), son of Amyntas, was a military commander of ancient Macedonia under Alexander the Great. He led the allied Greek infantry in Alexander's army when Antigonus I Monophthalmus was appointed satrap of Phrygia in 334 BCE.
After the occupation of Egypt in 331 BCE, he was one of the generals left behind in that country with a part of the army. Command of the Greek infantry was given to Canalus.
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Arsinoe of Macedon (Ancient Greek: Ἀρσινόη; lived 4th century BC) was an ancient Macedonian noblewoman and the mother of Ptolemy I Soter (323 – 283 BC), king of Ptolemaic Egypt.
Arsinoe was of the Argead dynasty, and originally a concubine of Philip II, king of Macedon, and it is said she was given by Philip to Lagus, a Macedonian nobleman, while she was pregnant with Ptolemy I Soter, but it is possible that this is a later myth fabricated to glorify the Ptolemaic Dynasty. Alternately, Ptolemy's lineage to the Argead dynasty was found through his mother, Arsinoe, in this case Arsinoe is daughter of Meleager, who was a cousin of Amyntas III and son of Balacrus, son of Amyntas, son of Alexander I of Macedon. Contemporary and modern research concludes the latter claim much more valid than Philip II as Ptolemy’s father, now dismissed as a myth.