Ill Bethisad

Ill Bethisad is an ongoing, collaborative alternate history project which currently has over 70 participants, originally created by Andrew Smith from New Zealand. It was initiated in 1997 as the Brithenig Project. It can be characterized as an instance of the subgenre of steampunk, and is known as one of the oldest and most elaborate alternate histories still functioning on the internet. Ill Bethisad has a largely encyclopedic character, consisting of constructed languages, written histories, timelines, news items, maps, flags and other images, short movies, descriptions of cultures, religions and technologies, as well as short stories.

Constructed languages play an important role in Ill Bethisad, and it can be said that Ill Bethisad is the central meeting point, if not the cradle, of an entire subgenre of conlangs, namely alternative languages. To date there are over thirty languages at varying levels of construction that play part. Among the languages spoken in Ill Bethisad are Brithenig (a Romance language with strong Celtic substrate influences, based on Welsh),Wenedyk (Polish as a Romance language), Bohemian (Pémišna: Germanized Czech), Dalmatian (a romance language similar to Romanian, based on the actual extinct language of the same name), Xliponian (another Romance language with a superficial resemblance to Albanian, spoken in our world's Epirus) and several Finnish-like "North Slavic" languages, including Nassian (spoken in our world's Karelia).

The name Ill Bethisad itself is Brithenig for the universe, a calque from Welsh bydysawd or Latin baptizatum.

...
Wikipedia