As it says in Wikipedia -
"The term Welsh literature may be used to refer to any literature originating from Wales or by Welsh writers. However, it more often refers to literature written in the Welsh language. Literature by Welsh writers in the English language is usually called Anglo-Welsh literature or Welsh literature in English.
This article will give an overview of the history of Welsh-language literature. For information about Welsh literature in English, see Anglo-Welsh literature. For more information about Welsh-language literature refer to the articles noted.
After literature written in the classical languages, literature in the Welsh language is the oldest surviving literature in Europe. The Welsh literary tradition still lives, stretching from the sixth century to the twentieth first. Its fortunes have fluctuated over the centuries, in line with those of the Welsh language. Even today the language of the early Middle Ages is recognisable to some modern-day Welsh speakers."
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And, as it says on this website about Welsh -
Welcome to My Welsh Page (Croeso i Fy Dudalen Gymraeg)
"Wales (Cymru) is a country that is a part of Great Britain, and although it is adjacent to England, it has a unique culture of its own. The Welsh language (Cymraeg) is the oldest language in Europe, with the oldest surviving Welsh manuscripts dating back to the 8th century A.D.
Believe it or not, the longest word in the Welsh language is the name of a town in North Wales called Llanfairpwllgwyngyllgogerychwyrndrobwllllantysyliogogogoch, which is actually several Welsh words run together. The English translation is as follows: "St. Mary's (Church) by the white aspen over the Whirlpool and St. Tysilio's (Church) by the red cave."
Because it is such a mouthful, the town is usually referred to as simply Llanfair. The Welsh language is still very much alive today, being spoken by nearly 600,000 people in Wales, including my mother, who grew up speaking it as her first language."
Learn Welsh (Disgu Cymraeg)
Sut dych chi?/How are you? (formal)
Sut wyt ti?/How are you? (informal)
Iawn, diolch/Fine, thank you
Bore da/Good morning
Prynhawn da/Good afternoon
Noswaith dda/Good evening
Nos da/Good night
Hwyl/Bye
Pob lwc/Good luck
Diolch/Thank you
Beth yw eich enw chi?/What is your name?
Dych chi yn siarad Cymraeg?/Do you speak Welsh?
Wyt ti yn siarad Cymraeg?/Do you speak Welsh? (informal)
Ble dych chi yn byw?/Where do you live? (formal)
Ble wyt ti yn byw?/Where do you live? (informal)
http://www.rachelvidrine.com/welshpage.html