here is a picture of the Loshult cannon , approximately from 1326 or so
its a vase shaped barrel and most probably the absolutely first model of cannon
there is an picture in an old manuscript dated 1326 of an very similar piece firing an arrow
thats how they dated it, I got that picture somewhere but I cant find it now
hope someone can post it here
its the only known existing vase cannon today
they made a copy at the middle age center in Denmark and did some experimental shooting with that one also