Paramessu came from a military family associated with the eastern Nile Delta. His father, Seti, is known as a troop commander, and the future king's own titles record service in the army and the administration. The Delta and its routes towards the Levant provided the setting for much of that career. His advancement demonstrates that a man outside the immediate reigning royal family could reach the highest offices, but it does not prove that the army ignored family background or operated as a modern meritocracy. His position depended on the institutions and personal relationships of the late Eighteenth Dynasty court.

Horemheb, himself a former military commander, designated Paramessu as his successor. The future king held senior offices, including the vizierate, and already had a family through whom the succession could continue. His wife was Sitre, and their son Seti would become Seti I. When Horemheb died, Paramessu took the royal name Ramesses and the throne name Menpehtyre. Later historical divisions place him at the beginning of the Nineteenth Dynasty. This marks a change of royal house, not evidence that every aspect of government was rebuilt at the same moment.

The length of his reign was short: less than two years, commonly placed around 1292-1290 BCE, although absolute dates vary between chronologies. The frequently repeated description of a sixteen-month reign should not be treated as an exact figure established beyond doubt. A brief reign limited the time available for building and for leaving a large body of inscriptions. It also means that later monuments made by his son and grandson can easily dominate the surviving picture. Ramesses I's historical importance is therefore not measured only by how much architecture carries his name.

At Karnak, his contribution belongs especially to the decoration of the Second Pylon, a structure begun under Horemheb. Inscriptions and reliefs there were altered by successive kings, so identifying the stages of work requires close study of the stone. The University of Memphis's Karnak project distinguishes Ramesses I's pylon decoration from the construction of the Great Hypostyle Hall, chiefly associated with Seti I and Ramesses II. It is misleading to turn Ramesses I into the securely established builder of the hall's first columns. Later scenes representing him also need not have been commissioned during his own lifetime.

His tomb, KV16, was cut in the Valley of the Kings. Its relatively compact plan and surviving religious decoration belong to the New Kingdom royal burial tradition. Scenes associated with the Book of Gates present the king's passage into the divine world, and the burial chamber preserves his sarcophagus. The tomb's scale is consistent with the limited time available during a short reign, but it cannot establish personal humility or a deliberate rejection of monumental burial. Its paintings and inscriptions are more direct evidence for royal funerary expectations than modern character judgements about the man buried there.

Seti I succeeded him and maintained his father's memory through royal monuments and religious observance. Ramesses II, the next generation, greatly enlarged the dynasty's monumental presence. Their achievements help explain why the founder is often introduced mainly through his descendants, but the three reigns must remain distinct. Works constructed or completed under Seti and Ramesses II should not automatically become projects that Ramesses I personally began. The continuity of the family was real; an exact account of every policy and building plan passing from father to son is not preserved.

The mummy associated with Ramesses I has a much later documented history. It formed part of the Niagara Falls Museum collection, which the Michael C. Carlos Museum at Emory University acquired in 1999. Examination considered the treatment and position of the body alongside scientific investigation, including X-rays and CT imaging. These observations suggested a possible royal identification, but the museum states that the research could not conclusively identify the individual. A resemblance to other royal mummies was not a substitute for an identifying inscription or decisive evidence.

The Carlos Museum returned the mummy to Egypt in 2003 because it could not exclude the possibility that the remains were those of a king. The return is a documented event; calling the body certainly Ramesses I goes beyond the evidence described by the museum itself. Keeping that distinction does not diminish the story. It separates the known history of an ancient ruler from the incomplete provenance and proposed identity of human remains that travelled through modern collections. Ramesses I's names, career, family and tomb remain the firmer foundations of his biography.