Gifts on this level are often symbolic, or filled with historic significance, more than anything else. Two once-enemies might give one another the blades their fathers wielded in battle against each other, or Queen Swordwraith give the Swordmage a staff cut from a great-tree deep in the Erebannien. A minor holy item of Cuiracean or such. Things like that.
There's also the opportunity to send a message at the same time. An enemy of Roesone could send him the "gift" of a banner of his armies that had been captured and taken as a trophy a generation ago - technically a fine gift, but one that quietly mocks his abilities in battle. There's almost endless possibilities if you're inventive
