Alpheos and Arethusa
The Greek fable says that Alpheos, the river-god, fell in love with the nymph Arethusa, who fled from him in affright. The god pursued under the sea, but the nymph was changed into a spring, which comes up in the harbour of Syracuse.
“We have seen a moustachioed Alpheos, at Ramsgate, pursue an affrighted Arethusa.” —London Review.
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894