Bilingual betrayal

Rodrigo Fernández de Santaella, Vocabulario eclesiástico (1499) says that a bilingual person is one who sings a different song depending on his location or conversational partner, a two-tongued [serpent]: Bilinguis y hoc bilingüe. quien dize vno aqui otro alli o vno a este y otro a aquel. E por esso se dize que tiene dos…