Lotan or Lawtan is the seven-headed sea serpent or dragon of Ugaritic myths. He is either a pet of the god Yamm or an aspect of Yamm himself; the cosmic ocean of myth is often known as a great stream. In the Hebrew analogue Lotan is who was also known as Yam the Leviathan. He represents the mass destruction of floods, oceans, and winter. He lives in a palace in the sea. He fights with Baal Hadad, who scatters him.
Leviathan
Dragons in Greek mythology for Ladon
Lernaean Hydra
Tiamat
Zahhak
Jörmungandr
Tannin (demon)
Rahab (demon)
The Beast (Bible) for The dragon in Rev
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