Sentence:  Now Wiſe, and Rich, and Worthie, and Wonderful, and Faithful and True, and Rare, & Charitable, and Great <WSD>"Laird</WSD> of Carnwath", Be not Prowd, altho I Commend you at ſuch a Rate behind your back and yet never ſaw You; [...] 
Meaning of the word marked with <WSD> tags:  "Often in the form" '''Laird of''', "followed by a patronymic": a Scottish clan chief.