How many overtures did Beethoven compose for Fidelio?

Beethoven composed four overtures for his only opera, Fidelio:

1. Leonore No. 1 (Op. 138): Composed in 1805 for the opera's original version, "Leonore."

2. Leonore No. 2 (Op. 72): Revised version of the overture, composed in 1805.

3. Leonore No. 3 (Op. 72a): Further revised version of the overture, composed in 1806.

4. Fidelio Overture (Op. 72b): Final version of the overture, composed in 1814 for the revised opera "Fidelio."