Following set is generally intended when speaking of Beethoven's last string quartets, including the Grosse Fuge (which also exists in a piano transcription, Opus 134):

• Opus 127: String Quartet No. 12 in E flat major (1825).
• Opus 130: String Quartet No. 13 in B flat major (1825).
• Opus 131: String Quartet No. 14 in C sharp minor (1826).
• Opus 132: String Quartet No. 15 in A minor (1825).
• Opus 133: Große Fuge in B flat major for string quartet (1826).
  • Opus 134: Piano arrangement (4 hands) of Große Fuge (1826).
• Opus 135: String Quartet No. 16 in F major (1826).

The quartets were commissioned in 1823 by Prince Nicholas Galitzin, who offered 50 ducats for each opus.

For Grosse Fuge: see also String Quartet No. 13, and of course also P. D. Q. Bach, who composed a Grossest Fugue.