Seti I's tomb was located inside a mountain rather than built within a pyramid. This had been the rule since the Eighteenth Dynasty of Egypt. The last pyramid built for Ahmose I was not intended for burial either—though there may once have been such plans, as the last pharaoh of the Seventeenth Dynasty, it was no longer for him to decide.
Seti I's name came from Set, the desert god who had tricked and killed Osiris in mythology before later being slain by Horus. His son, Ramses II, took his name from the meaning "son of Ra."
According to Ancient Egyptian funeral customs, the eldest son of the deceased had to dress as Horus, even at royal funerals.
If the deceased truly had no son, a funerary priest would dress as Horus and burn incense or sprinkle purified water before the procession carrying the coffin. According to mythology, Horus also helped Isis recover Osiris's remains, allowing him to be resurrected.
According to the reliefs and murals left behind by Ancient Egypt, priests would conduct the "Opening of the Mouth" ritual before a mummy was buried. The Book of the Dead also recorded spells whose purpose was to grant it life, or to protect the dead in some way.
Yet Seti I's mummy had its mouth closed. His mummy was very well preserved, and his face appeared peaceful. Of course, passing away with such an expression was also a good thing.
Like Ramses II, Seti I loved grand construction projects. The young prince's first job had even been as a quarry overseer, supplying building materials for the tomb complexes of Thebes, the Temple of Amun at Karnak, the Temple of Abydos, and other sites.
The grueling labor sparked a small riot at the quarry, which Egypt's future successor easily put down.