The history behind the design
This Magna Carta clause 61 t-shirt pairs 'Knowledge is Power' with the 1215 security clause, also called chapter 61 (the original charter had no numbers; historians added them later).
Clause 61 of the 1215 Magna Carta, often called the security clause, set up a council of twenty-five barons to make sure King John kept the charter. If the king or his officials broke its terms and failed to put things right, the barons, with the support of “the commune of the whole land”, could lawfully press him until the wrong was corrected.
The clause was the main reason Pope Innocent III annulled the charter in August 1215, and it was left out of every later reissue. The phrase “knowledge is power” is usually traced to Francis Bacon, who wrote ipsa scientia potestas est in 1597.