Merneptah was a son of Ramesses II and Isetnofret I, one of the king's principal wives. His position as thirteenth son placed several older princes ahead of him, but the length of his father's reign changed the succession. He eventually became heir and then king, conventionally dated to about 1213 BCE. He was already an older man by the standards of royal accession. His earlier military responsibilities form part of his career, but the surviving evidence does not justify a colourful account of precisely how every older brother died or how the court reacted to his advancement. What can be said securely is that his kingship followed a long period within the Ramesside royal household.

The major conflict of his fifth regnal year came from the west. A Libyan-led coalition, including groups commonly discussed under the modern label Sea Peoples, entered the Delta region. Royal inscriptions celebrate Merneptah's defeat of this force. The Great Karnak Inscription supplies names, captured goods and casualty claims, while other monuments present the victory as protection granted by the gods. These are important historical records, but they are not neutral battlefield reports. Exact totals and claims of overwhelming success belong to the royal account and should be attributed accordingly. The collective term Sea Peoples also needs care: it does not mean that every group named by Egyptian scribes formed one nation with a single origin and purpose.

The Merneptah Stela turns military achievement into a royal victory hymn. Its best-known closing section names several places and peoples associated with the Levant, including Ashkelon, Gezer, Yanoam and Israel. The reference to Israel, around 1208 BCE in the conventional chronology, is widely accepted as the earliest secure extra-biblical attestation of that name. The accompanying signs classify Israel as a people rather than a place-name of the same kind as the listed cities. They do not, on their own, describe its complete social or political organisation. The boast that an enemy has been eliminated is likewise the language of victory, not independent proof of literal extinction. The inscription is valuable precisely when its information and its purpose are read together.

At Memphis, Merneptah left evidence beyond the battlefield. Excavations at Mit Rahina by the University of Pennsylvania recovered material from his ceremonial palace near the sanctuary of Ptah, including decorated architectural elements. This palace belongs to a city that remained important for royal administration and religious life even when other centres drew much of the attention. His name, conventionally translated as Beloved of Ptah, connected him with the city's great craftsman god. The material remains allow the ruler to be studied through construction, ceremonial space and inscriptions, rather than only through the literary force of a victory hymn.

His reign also included military activity in Nubia. Such campaigns show that royal authority had to be maintained on more than one frontier, but the available record should not be expanded into a claim that every problem was permanently settled. Merneptah inherited the institutions and international relationships of his father's reign, not a kingdom outside the pressures of its age. The shortness of his own rule makes the surviving building and inscriptional evidence particularly important. Each monument records an action or a chosen royal image; none gives a complete explanation of the government's daily work.

Merneptah was buried in KV8 in the Valley of the Kings. His mummy was later moved to the tomb of Amenhotep II, KV35, as part of the protection and reorganisation of royal burials, and it was found there in 1898. The tomb and the recovered body therefore preserve different stages of his funerary history. KV8 was his original royal resting place, while KV35 was the later cache in which his remains survived. Confusing the two would obscure the efforts of later custodians as well as the history of the burial itself.

His son Seti II belonged to the troubled succession that followed. Amenmesse challenged Seti II's authority in Upper Egypt, although the exact relationship and chronology of the rival claims remain debated. This later conflict should not be turned into a simple moral verdict on Merneptah's reign. His historical record is narrower and more concrete: royal descent, accession, campaigns, a ceremonial palace, inscriptions and a tomb. The legendary pharaoh Mernebptah appears in a different kind of evidence, the story of Naneferkaptah and the Book of Thoth. Similar royal names can connect literary memory with Egypt's past without making every episode of a tale a documented event.