Claim: Macbeth is by English playwright William Shakespeare.
Evidence: Macbeth -LRB- -LSB- məkˈbɛθ -RSB- full title The Tragedy of Macbeth -RRB- is a tragedy by William Shakespeare ; it is thought to have been first performed in 1606.
William Shakespeare -LRB- -LSB- ˈʃeɪkspɪə -RSB- 26 April 1564 -LRB- baptised -RRB- -- 23 April 1616 -RRB- was an English : poet , : playwright , and actor , widely regarded as the greatest writer in the English language and the world 's pre-eminent dramatist.