It is written in Ladino (Judeo-Spanish), the language spoken by Sephardic Jews after their expulsion from Spain in 1492. although the song is not medieval, it is preformed with medieval instruments. It is linked to the Ladino adaptation of an 1891 Greek play titled "O agapitikos tis voskopoulas" (The Shepherdess's Beloved), written by Spyridon Koromilas. this specific version is preformed by Psalteria.
Psalteria for preforming the music.