Perhaps you are asking about a time when Welsh usage declined? Here are some key periods in Welsh history that saw shifts in language use:
* Roman Period (43-410 AD): Latin was the dominant language, but Welsh (or its predecessor, Brittonic) continued to be spoken by the native population.
* Middle Ages (5th - 15th centuries): Welsh thrived as the primary language of the country. However, Norman influence brought in French, which later transitioned to English.
* Early Modern Period (16th - 18th centuries): English became increasingly dominant due to factors like the Tudor conquest of Wales and the English Reformation. Welsh speakers faced discrimination, and English was imposed as the language of administration and education.
* 19th Century: A Welsh revival began, fueled by nationalist sentiments and efforts to preserve the language. This saw increased literacy in Welsh and the establishment of Welsh language schools.
* 20th and 21st Centuries: The Welsh language continues to be used and promoted, with Welsh-medium education being widely available. There are ongoing efforts to increase its use in public life and media.
Therefore, while Welsh usage has fluctuated throughout history, it has never completely ceased to be spoken. Today, the Welsh language is a vital part of Welsh culture and identity, and efforts are being made to ensure its future.