Chasetown, whilst playing at Level 8 of English football during the 2007–08 competition, are the lowest-ranked team to play in the Third Round Proper (final 64, of 731 teams entered that season). Chasetown was then a member of the Southern League Division One Midlands (a lower level within the Southern Football League), when they lost to Football League Championship (Level 2) team Cardiff City, the eventual FA Cup runners-up that year. Their success earned the lowly organisation over £60,000 in prize money.

Who is the lowest rank to play in the  third round proper?