Sentence:  I Don't pretend to write a Preface, either to point out the Beauties, or to excuse the Errors, a judicious Reader may possibly discover in the following Scenes, but to give those excellent <WSD>Comedians</WSD> their Due, to whom, in some Measure the best Dramatick Writers are oblig'd. 
Meaning of the word marked with <WSD> tags:  A person who performs in theatrical plays.