Arvorec is an a posteriori fictional conlang created by Deiniol Jones in 2000. It is a fictional daughter of the continental Celtic language, Gaulish. It is written using a modified Latin alphabet (much in the same way as modern Celtic languages are).
Its homepage includes a phonology, grammar, dictionary, and even information on fictional dialects.
A's lavraef yn bellavryth dwy, ac a'm ngwadas March e dlynas ben an barayer bochet e thrógocarea.
I was speaking to him on the phone yesterday and Mark told me that the baker's wife stole a handbag out of the charity shop.