Variation in Middle Welsh Conjugated Prepositions: Chronology, Register and Dialect

Middle Welsh can now be studied exhaustively owing to the availability of millions of words of text, mostly in machine-readable form. This paper analyses the extensive variation in conjugated prepositions seen in thirteenth-century manuscripts, and uses it to shed light on the evolution of the language between Old and Modern Welsh, on the varying linguistic preferences of poets and prose writers, and on the emergence of the Welsh dialects.