“Abimelech” literally translates as ‘Father of the King’. It was the traditional title of the vizier in Middle Eastern monarchies. (Because the king was considered divine, so no mere mortal had the right to advise him or speak on his behalf)
Often, the vizier did the actual ruling, while the king stayed in the palace and played politics / partied with the nobles.
“You can only stab yourself in the back…. But on my command”