Asopus had a daughter named Sinope with Metope (also Thebe). She was abducted by Apollo. He took her to Paphlagonia, where she gave birth to Syrus. It is not clear if Sinope is the same as the daughter above, kidnapped by Zeus--alternate version?
He was sometimes the father of Antiope.
wikipedia.org dumped 2003-03-17 with terodump