The article claims that the trujamán (linguistic intermediary in a negotiation) and his activity as interpreter-translator are essential for political and economic mediations not only in the Mediterranean, but all around Europe. He, as translator for specific purposes and as an interpreter for the community (or even as a translator acting as notary), was the center of a system where many texts had a legal situation depending on the interpretation, both linguistic and hermeneutic, of the trujamán.