Seti I in Wikipedia

Menmaatre Seti I (also called Sethos I after the Greeks) was a Pharaoh of Ancient Egypt (Nineteenth dynasty of Egypt), the son of Ramesses I and Queen Sitre, and the father of Ramesses II. As with all dates in Ancient Egypt, the actual dates of his reign are unclear, and various historians claim different dates, with 1294 BC – 1279 BC[4] and 1290 BC to 1279 BC[5] being the most commonly used by scholars today. The name Seti means "of Set", which indicates that he was consecrated to the god Set (commonly "Seth"). As with most Pharaohs, Seti had several names. Upon his ascension, he took the prenomen mn-m3‘t-r‘, which translates as Menmaatre in Egyptian, meaning "Eternal is the Justice of Re."[1] His better known nomen, or birth name is technically transliterated as sty mry-n-ptḥ, or Sety Merenptah, meaning "Man of Set, beloved of Ptah". Manetho incorrectly considered him to be the founder of the 19th dynasty. The alleged coregency of Seti I Around Year 9 of his reign, Seti appointed his son Ramesses II as the Crown Prince and his chosen successor, but the evidence for a coregency between the two kings is likely illusory. Peter J. Brand who has published an extensive biography on this Pharaoh and his numerous works, stresses in his thesis[6] that relief decorations at various temple sites at Karnak, Qurna and Abydos which associate Ramesses II with Seti I, were actually carved after Seti's death by Ramesses II himself and, hence, cannot be used as source material to support a co-regency between the two monarchs. In addition, the late William Murnane who first endorsed the theory of a co-regency between Seti I and Ramesses II[7] later revised his view of the proposed co-regency and rejected the idea that Ramesses II had begun to count his own regnal years while Seti I was still alive.[8] Finally, Kenneth Kitchen rejects the term co-regency to describe the relationship between Seti I and Ramesses II; he describes the earliest phase of Ramesses II's career as a "prince regency" where the young Ramesses enjoyed all the trappings of royalty including the use of a royal titulary and harem but did not count his regnal years until after his father's death.[9] This is due to the fact that the evidence for a co-regency between the two kings is vague and highly ambiguous. Two important inscriptions from the first decade of Ramesses' reign, namely the Abydos Dedicatory Inscription and the Kuban Stela of Ramesses II, consistently give the latter titles associated with those of a Crown Prince only, namely the "king's eldest son and hereditary prince" or "child-heir" to the throne "along with some military titles."[10] Hence, no clear evidence supports the hypothesis that Ramesses II was already a co-regent under his father. Brand stresses that: " Ramesses' claim that he was crowned king by Seti, even as a child in his arms [in the Dedicatory Inscription], is highly self-serving and open to question although his description of his role as crown prince is more accurate...The most reliable and concrete portion of this statement is the enumeration of Ramesses' titles as eldest king's son and heir apparent, well attested in sources contemporary with Seti's reign."[11]...

Link: https://en.wikipedia.org/wiki/Seti_I