Alexander was the son of Amyntas I

Amyntas I of Macedon

Amyntas I was a king of Macedon. He was a son of Alcetas I of Macedon and his queen. He married a woman called Eurydice and had a son Alexander....

 and Queen Eurydice

Eurydice (disambiguation)

Eurydice is the wife of the musician OrpheusEurydice may also refer to:-Greek Mythology:* Eurydice of Thebes, wife of Creon and mother of Haemon, Menoeceus and Megara* Eurydice of Argos, wife of King Acrisius and mother of Danae...

.

According to Herodotus

Herodotus

Herodotus was an ancient Greek historian who was born in Halicarnassus, Caria and lived in the 5th century BC . He has been called the "Father of History", and was the first historian known to collect his materials systematically, test their accuracy to a certain extent and arrange them in a...

, he was unfriendly to Persia

Achaemenid Empire

The Achaemenid Empire , sometimes known as First Persian Empire and/or Persian Empire, was founded in the 6th century BCE by Cyrus the Great who overthrew the Median confederation...

, and had the envoys of Darius I

Darius I of Persia

Darius I , also known as Darius the Great, was the third king of kings of the Achaemenid Empire...

 killed when they arrived at the court of his father during the Ionian Revolt

Ionian Revolt

The Ionian Revolt, and associated revolts in Aeolis, Doris, Cyprus and Caria, were military rebellions by several regions of Asia Minor against Persian rule, lasting from 499 BC to 493 BC...

. However, he was forced to submit to Persia during the invasion of Greece

Greece

Greece , officially the Hellenic Republic , and historically Hellas or the Republic of Greece in English, is a country in southeastern Europe....

 by Darius' son Xerxes I, and he acted as a representative of the Persian governor Mardonius

Mardonius

Mardonius was a leading Persian military commander during the Persian Wars with Greece in the early 5th century BC.-Early years:Mardonius was the son of Gobryas, a Persian nobleman who had assisted the Achaemenid prince Darius when he claimed the throne...

 during peace negotiations after the Persian defeat at the Battle of Salamis

Battle of Salamis

The Battle of Salamis was fought between an Alliance of Greek city-states and the Persian Empire in September 480 BCE, in the straits between the mainland and Salamis, an island in the Saronic Gulf near Athens...

 in 480 BC.