Aldor the Old - Brego's son, Eorl's grandson.

"He was Brego's second son.  He became known as the Old, since he lived to a great age, and was king for 75 years.  In his time the Rohirrim increased, and drove out or subdued the last of the Dunlendish people that lingered east of Isen.  Harrowdale and mountain-valleys were settled.  Of the next three kings little is said, for Rohan had peace and prospered in their time." ~The Return of the King (Appendix A)