I do know that Eorl, first King of Rohan, made an oath. The oath was Rohan will come to Gondor's aid in time of need (the beacons), and in return, Rohan was given Calenharden. That is probably the "truce" Faramir was talking about. I believe the current steward at that time was Cirion.
If you want to read more on this check out the appendix in LOTR, the House of Eorl section.
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Fenris Penguin
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