Think you know what famed playwright William Shakespeare looked like? Traditionally, he’s been described as a slender man with dark hair that billowed down his shoulders and a carefully manicured mustache. The truth is, we have no idea. There’s never been a verifiable portrait of the writer.

Until now. Experts recently discovered what could be the only known portrait of William Shakespeare made in his lifetime. It shows Shakespeare at age 33, and is the only known verifiable portrait of the legendary writer.

How was it discovered it? In a 400-year-old botany book that contains an engraving on the title page of four famous figures — one of whom is supposedly Shakespeare.

Learn more at The Guardian.