Spanish translation: ...el ya / antes mencionado intérprete...
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Explanation: En el sitio de la referencia aparece "recited" con el sentido de "ya mencionado", que creo que se puede ajustar a tu contexto:
"In witness of all and every thing herein determined, by and between the before recited contracting parties, we have, in full and open council, at the Cherokee Agency, this eighth day of July, A. D. one thousand eight hundred and seventeen, set our hands and seals."