Llywelyn, Prince of Wales, Lord of Snowdon, to King Edward [I], 1273, about Dolforwyn Castle. Translated (in précis) from Latin.
I have received the letter written in your name, dated at Westminster June 20, forbidding me to construct a castle on my own land near Aber Miwl, or to establish a town or market there.
But I am certain that this letter did not come forth with your knowledge, and that if you were present in your kingdom, such a mandate would not be issued from your chancery.
For you well know that the rights of my principality are entirely separate from the rights of your realm although I hold my principality under your power. And you have heard and in part seen that my ancestors and I had the power within our boundaries to build and construct castles and fortresses and [set up] markets without prohibition by anyone or any announcement of new work.
I pray you, do not listen to the evil suggestions of those who try to exasperate your mind against me.
July 11 , at Dinorben (translated from Latin)