Desde scriptae leonesas a scriptae castellanas en el fondo documental del monasterio de San Pedro de Eslonza. Grafías romances y, ll y j, i para lat. -Li-, diacronía, difusión léxica y factores de frecuencia.

The present paper studies castilianization processes in Leonese scriptae from the monastery of San Pedro de Eslonza and it’s surroundings between 1241 and 1399 focussing on Romance writings for the respective sounds originating in lat. -li-. We will show, that the process is not only relatively abrupt, but also follows a lexical diffusion depending on the frequency of the lexemes in question. The graphemes are probably the most eyecatching characteristic of Leonese scriptae, their eventual substitution by Castilian graphemes of the type therefore provides the researcher with an excellent basis for the investigation of the mentioned castilianization. The arrival of Castilian writing systems in the –then former– Kingdom of Leon marks the first step towards a Castilian (later Spanish) written language in what later on will be the Realm of the Kingdom of Spain.