Amyrtaios was the only ruler of the Twenty-eighth Dynasty. He is thought to have been a Libyan. He ruled Egypt
from Sais for six years. He began his reign after the death of Darius II when there was a renewed revolt in Egypt.
They achieved independence for a short time again. On the Elephantine Papyri, there is documentation of a loan
contract that is written in the year 5 of this king. This is indication that he was recognized in Upper and Lower
Egypt. He must have driven the Persians out of the whole country.
Amyrtaeus (or Amenirdisu) of Sais is the only king of the Twenty-eighth dynasty of Egypt and is thought to be related to the
royal family of the Twenty-sixth dynasty. He ended the First Persian Occupation and reigned from 404 BC to 399 BC.
Amyrtaeus was probably the grandson of the Amyrtaeus of Sais who is known to have carried on a rebellion in 465–463 BC with
the Libyan chief, Inarus (himself a grandson of Psamtik III), against the Satrap of Artaxerxes I. He is known from Aramaic
and ancient Greek sources, and is mentioned in the Demotic Chronicle. He is not known to have left any monuments, and his
name in Egyptian is only reconstructed from demotic notices.
Before assuming the throne of Egypt, Amyrtaeus had revolted against Darius II as early as 411 BC, leading a guerrilla action
in the western Nile Delta around his home city of Sais. Following the death of Darius, Amyrtaeus declared himself king in 404
BC. According to Isocrates, Artaxerxes II assembled an army in Phoenicia under the command of Abrocomas to retake Egypt
shortly after coming to the Persian throne, but political problems with his brother Cyrus the Younger prevented this from
taking place, allowing the Egyptians sufficient time to throw off Achaemenid rule. While the rule of Amyrtaeus in the western
Delta was established by 404 BC, Artaxerxes II continued to be recognized as king at Elephantine as late as 401 BC, but
Aramaic papyri from the site refer to Regnal Year 5 of Amyrtaeus in September 400 BC. The Elephantine papyri also demonstrate
that between 404 and 400 BC (or even 398) Upper Egypt remained under Persian control, while the forces of Amyrtaeus dominated
Amyrtaeus was defeated in open battle by his successor, Nepherites I of Mendes, and executed at Memphis, an event which the
Aramaic papyrus Brooklyn 13 implies occurred in October 399 BC.