This is one of the 23 delegations (satrapies) shown bringing offerings to the King during the New Year (Nou Rutz) festival.
The bas relief of each delegation provides valuable insight into the clothes and gifts from each region at that time.

The Libyans are shown 2nd from left on the oblique (slanting) tier of the Apadana stairway.

They are represented by 3 members, and bring a gift of a 2 horse chariot, a mountain goat and 2 lances.

The original bas relief is shown in two of the photographs (with low tonal range due to the shade).
The other photographs have been digitally enhanced by blurring the background in order to reveal their otherwise hidden beauty.
I hope you find them as fascinating as I do.