Which football team was the first to achieve the English football double (win the Football League and the FA Cup)?

Preston North End Football Club (often shortened to PNE) is a professional association football club located in the Deepdale area of Preston, Lancashire. They play in the Championship, the second tier of the English football league system.

The club was a founding member of the Football League and completed the inaugural season unbeaten to become the first league champions, in the same season winning the FA Cup without conceding a goal to become the first club to achieve the English football "Double". Preston's unbeaten League and Cup season earned them the nickname "The Invincibles".

Preston's most recent major trophy success was their FA Cup victory over Huddersfield Town in 1938. Many notable players have played for the club, including Tom Finney, Bill Shankly, Tommy Docherty, Alan Kelly, Sr. and Graham Alexander.

Based on results achieved in the Football League from 1888–89 to 2015–16, Preston were ranked as the fourth most-successful English football club of all time domestically, while only Notts County had played more Football League games than Preston.