Why is Poseidon so biased against Ulysses?

Poseidon harbors a deep grudge against Ulysses because he blinded his son, the Cyclops Polyphemus, during their encounter. This act of revenge incited Poseidon's wrath, leading him to hinder Ulysses' journey home to Ithaca. Additionally, Ulysses' cleverness and defiance of the gods further fueled Poseidon's animosity, as he represented a challenge to divine authority. Thus, Poseidon's bias against Ulysses is rooted in personal loss and a desire to assert his power over mortals.