When did Eli become a priest?

Eli became a priest during the time of the Judges in ancient Israel, as described in the biblical books of 1 Samuel. He served as the high priest at Shiloh, where the Tabernacle was located. His priesthood is highlighted in the narrative surrounding the early life of the prophet Samuel. While the exact date of his appointment is not specified, it is understood to be before Samuel's calling, which began around 1100 BCE.