It depended on what countries they lived in. There were medieval knights in dozens of countries in the Middle Ages.
If you are talking about the knights of England, the languages were:
How do you talk to the girl in the hay loft at astro knights island?
You talk to the knights on different planets
Press enter then type what you want to say.
i think you talk to them and and select add
you can talk to her in the door on the bottom of the windmill . go in she will be on the top of the inside of the windmill
Talk to the freckled guy with the spade. He's by the mill.
You don't defeat knights, you talk to them and they'll give you a weapon to defeat a beast. (On the jungle planet, find the Laser Lance down in the plants before you meet Sir Cador.)
In Anvil, next to the Chapel. Talk to the priest outside.
Go to the guy in the green hood. Talk to him. He will give you the manure.
go to anvil church and across from the entrance is an old man... talk to him
Speak to the Prophet. He is preaching in front of the church of Akatosh.
I still can't beat him. Talk about a difficulty curve.