Marathonius

In Greek mythology, Marathonius was son of Deucalion and Pyrrha, the legendary progenitors, and brother of Orestheus and Pronous, father of Hellen.[1][2]
Note

Hecateus fr. 1F13

Gantz, Timothy (1993). Early Greek Myth: A Guide to Literary and Ancient Sources. The John Hopkins Press Ltd., London: The John Hopkins University Press. p. 167. ISBN 0-8018-4410-X.

Reference

Gantz, Timothy, Early Greek Myth: A Guide to Literary and Artistic Sources, Johns Hopkins University Press, 1996, Two volumes: ISBN 978-0-8018-5360-9 (Vol. 1), ISBN 978-0-8018-5362-3 (Vol. 2).