What famous work was written by sir thomas?

You're likely thinking of Sir Thomas More, the English lawyer, social philosopher, author, and statesman who served as Lord Chancellor of England from 1529 to 1532.

His most famous work is Utopia, a book published in 1516 that describes an ideal society on a fictional island. It is a foundational text in political philosophy and has been widely influential throughout history.

While it's not the only work he wrote, Utopia is undoubtedly his most famous and enduring piece.