For a time, it wasn't that uncommon for sides outside the top flight to reach the FA Cup final: half of the finals between 1973 and 1982 featured a second-tier side, with Sunderland, Southampton and West Ham United even managing to win it.
But since the Premier League was founded in 1992, it has happened on just two occasions, with Millwall becoming the first club to break that run when they made it to their first-ever FA Cup final in 2004.