The king you are asking about is very likely King John of England, who signed an important document called the Magna Carta.
But to be accurate, there were a lot of medieval kings who signed documents.
Magna Carta
The Magna Carta (: Why did King John sign the Document?
King Henry VIII
Magna Carta.
The king
bubbles
the king
I'd say King John
The Magna Carta.
in a castle with a king
the was the best king
the answer is not there :(