Original: Wallace was the inspiration for the poem, The Acts and Deeds of Sir William Wallace, Knight of Elderslie, by the 15th-century minstrel, Blind Harry and this poem was to some extent the basis of Randall Wallace's screenplay for the 1995 film Braveheart.
Simplified: A book called The Acts and Deeds of Sir William Wallace, Knight of Elderslie was written by a minstrel named Blind Harry in the 15th century.