Bishop-fish
The Sea bishop or Bishop-fish was a type of sea monster reported in the 16th century. According to legend, it was taken to the King of Poland, who wished to keep it.
It was also shown to a group of Catholic bishops, to whom the bishop-fish gestured, appealing to be released. They granted its wish, at which point it made the sign of the cross and disappeared into the sea.
When the bishop fish was angry, the sea would extend its lengthy arms, it is said, and the bishop fish would entrap a fisherman's boat. The bishop fish would then find the location of the sea-mans' daughter and warp her to his lair.
He would later, feast on the young female and absorb her energy, where then the bishop fish would send the carcass back to the fisherman. The storms would clear and leave the ocean at rest.
Another was supposedly captured in the ocean near Germany in 1531. It refused to eat and died after three days. It was described and pictured in the fourth volume of Conrad Gesner's famous Historiae animalium.
Since the Bishop-fish was caught in the same year as the Sea Monk, it is suggested the two are somehow related.