Who is Orthagoras from The Politics of Aristotle and what is their importance?

This man is named by Aristotle in Book 5 as the sire of the family group of father & sons who secured the longest running tyranny of which Aristotle is aware. Orthagoras the tyrant ruled the Sicyonians. He was able to pass on rule to his sons, possibly in group succession. Their combined reign lasted 100 years. This comes up as part of Aristotle's argument to show readers than on a purely practical level, tyranny is not the best way to go for a stable, enduring form of government.