Alban, yr.
Great Britain, although Welsh people would say that they live in Wales, Scots would say that they live in Scotland and English people would say that they live in England.
"You are Welsh" = Rwyt ti'n Gymreig
Scottish people live in Scotland. Welsh people live in Wales.
He was born at Kilpatrick, near Dumbarton, in Scotland, about the year 387. The Welsh say he was born in Wales. Take your pick.
Gaelic is native to Ireland, Scotland and Man; Welsh is Celtic but not Gaelic. That said, the Welsh word for 'castle' is castell.
'Our Friends' in Welsh is 'Ffrindiau Ni' :)
To say "your house" in Welsh, you would say "eich tŷ".
Cymraeg
No in Welsh is dim.
John Higgins (Scotland) is the winner of 2010 Welsh open (Snooker)
"y diwedd" is how you say it in Welsh language.
In Welsh, you would say "Rwy'n cytuno" to say "I agree."