Langarus king of the Agrianians, was a contemporary of Alexander the Great (336–323 BC), with whom he ingratiated himself even before the death of Philip II

Philip II of Macedon

Philip II of Macedon "friend" + ἵππος "horse" — transliterated ; 382 – 336 BC), was a king of Macedon from 359 BC until his assassination in 336 BC. He was the father of Alexander the Great and Philip III.-Biography:...

, previous king of Macedon

Macedon

Macedonia or Macedon was an ancient kingdom, centered in the northeastern part of the Greek peninsula, bordered by Epirus to the west, Paeonia to the north, the region of Thrace to the east and Thessaly to the south....

. He rendered Alexander important services shortly after his accession, in his expedition against the Illyria

Illyria

In classical antiquity, Illyria was a region in the western part of the Balkan Peninsula inhabited by the Illyrians....

ns and Taulantians, when the Autariatae

Autariatae

The Autariatae or Autariates were an ancient people that eventually became the most powerful Illyrian tribe. Their territory was called...

 were preparing to attack him on his march. Langarus by an invasion of their territory prevented them from carrying their purpose into effect. Alexander conferred on him the most distinguished marks of his regard and favour, and promised him his half-sister Cynane

Cynane

Cynane was half-sister to Alexander the Great, and daughter of Philip II by Audata, an Illyrian princess....

in marriage; but Langarus died soon after his return home.