How did Julien Maunoir’s 1659 dictionary influence written Breton?

The publication of Julien Maunoir’s dictionary in 1659 is widely recognized as the emergence of written Modern Breton. Its primary influence on the written language was the introduction of a new, more phonetic orthography.12

While this development was significant for the evolution of written Breton, the dictionary itself had little impact on the spoken language. Following its publication, standards for written Breton continued to develop separately across the four Breton-speaking bishoprics, leading to regional variations in the written norm that persisted until later efforts in the 18th and 19th centuries sought to establish a single, unified standard.1