“…There is a substantial body of research dealing with the development of the sibilant system in Spanish (Ford 1900, Espinosa 1935, Montoliu 1945, Joos 1952, Jungeman 1955, Catalán 1957, Dámaso Alonso 1962, Galmés de Fuentes 1962, Amado Alonso 1967, Martinet 1955, Malkiel 1971, Lantolf 1974, Kiddle 1977, Lloyd 1987, Harris-Northall 1992, Salvador & Ariza 1992, Pensado 1993, and Penny 1993. In this section, we first present the major diachronic stages involving voiced and voiceless sibilants, beginning with the medieval period.…”